Ross, P. (1983). Introducing LOGO: For the Apple II computer, Texas Instruments 99. Addison-Wesley Publishing Company.
Dyfyniad Arddull ChicagoRoss, Peter. Introducing LOGO: For the Apple II Computer, Texas Instruments 99. Reading, Massachusetts: Addison-Wesley Publishing Company, 1983.
Dyfyniad MLARoss, Peter. Introducing LOGO: For the Apple II Computer, Texas Instruments 99. Addison-Wesley Publishing Company, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.