Bull, G.L. & Bull, G.L. (1995). Windows on Logo: Animation. Logo Exchange. 13 (3), 34-37.
Bull, G.L., Bull, G.L. & Kent, T. (1995). Windows on Logo: A Dialog with a Computer. Logo Exchange. 13 (4), 39-42.
Bull, G.L., Bull, G.L. & Kent, T. (1995). Control Simulations (Part I): Lamp and Temperature Sensor. Logo Exchange. 14 (1), 29-33.
Bull, G.L., Bull, G.L. & Kent, T. (1995). Control Simulations (Part II): Fan and Thermostat. Logo Exchange. 14 (2), 29-33.
Bull, G.L., & Bull, G.L. (1994). Electronic coordinates. Logo Exchange. 12 (2). 25-30.
Bull, G.L., Bull, G.L., & Mason, M. (1994). Using Logo to teach: the case of triangles with unequal sides. Logo Exchange. 12 (3). 25-30.
Bull, G.L., Bull, G.L., & Appert, C. (1994). Color displays and hypermedia. Logo Exchange. 12 (4). 13-16.
Bull, G.L. & Bull, G.L. (1994). Visible variables. Logo Exchange. 13 (1).
Bull, G.L. & Bull, G.L. (1993). Windows on Logo: screen robots. Logo Exchange. 11 (3). 20-24.
Bull, G.L. & Bull, G.L. (1993). Windows on Logo: LEGO robotics in a Macintosh environment. Logo Exchange. 11 (4). 23-25.
Bull, G.L. & Bull, G.L. (1993). Windows on Logo: gear ratios Ð a simulation. Logo Exchange. 12 (1). 26-28.
Bull, G.L. & Bull, G.L. (1993). Windows on Logo: electronic coordinates. Logo Exchange. 12 (2). 20-23.
Bull, G.L. & Bull, G.L. (1992). Windows on Logo: Hypermedia links with Logo. Logo Exchange. 10 (3). 28-32.
Bull, G.L. & Bull, G.L. (1992). Windows on Logo: Experiments with language and letters. Logo Exchange. 10 (4). 16-20.
Bull, G.L. & Bull, G.L. (1992). Windows on Logo: An electronic Logo Exchange. Logo Exchange. 11 (1). 16-18.
Bull, G.L. & Bull, G.L. (1992). Windows on Logo: An electronic community. Logo Exchange. 11 (2).
Bull, G.L., & Bull, G. (1991). Logo connections: Digitized images. Logo Exchange. 9 (4), 25-28.
Bull, G.L., & Bull, G. (1991). Logo connections: Logo robotics. Logo Exchange. 9 (5), 25-28.
Bull, G.L., & Bull, G. (1991). Logo connections: Logo and videodiscs. Logo Exchange. 9 (6), 11-15.
Bull, G.L., & Bull, G. (1991). Logo connections: Logo and telecommunications. Logo Exchange. 9 (7), 24-26.
Bull, G.L., & Bull, G. (1991). Logo connections: A turtle in your window. Logo Exchange. 9 (7), 24-28 .
Bull, G.L., & Bull, G. (1991). Windows on logo: The first decade of LX. Logo Exchange. 10 (1), 33-38.
Bull, G.L., & Bull, G. (1991). Windows on logo: Pictograms. Logo Exchange. 10 (2), 20-22.
Bull, G., & Bull, G. (1990). Logo & company: Sight and sound - the next decade (Part II: visions of the 90's). Logo Exchange. 8 (5), 24-29.
Bull, G., & Bull, G. (1990). Logo & company: A Logophile's introduction to HyperCard. Logo Exchange. 8 (6), 22-27.
Bull, G., & Bull, G. (1990). Logo & company: Creating SETX and SETY in HyperCard. Logo Exchange. 8 (7), 23-27.
Bull, G., & Bull, G. (1990). Logo & company: Building a turtle in HyperCard. Logo Exchange. 8 (8), 27-30.
Bull, G., & Bull, G. (1990). Logo & company: Turtle graphics for HyperCard. Logo Exchange. 8 (9), 23-28.
Bull, G., & Bull, G. (1990). The gears of childhood. Logo Exchange. 8 (9), 11-16.
Bull, G., Bull, G, Cochran, P., & Appert, C. (1990). Logo connections: Six practical multimedia suggestions for Logo. Logo Exchange. 9 (1), 19-22.
Bull, G., & Bull, G. (1990). Logo connections: Creating a hypermedia adventure story with Logo. Logo Exchange. 9 (2), 22-25.
Bull, G., & Bull, G. (1990). Logo connections: Imported Graphics. Logo Exchange. 9 (3), 25-28.
Bull, G., & Bull, G. (1990). Logo connections: Digitized images. Logo Exchange. 9 (4), 25-28.