Jensen, C., & Anderson, L. (1992). Pal for paradox 4 made easy. Osborne McGraw Hill.
Dyfyniad Arddull ChicagoJensen, Cary, and Loy Anderson. Pal for Paradox 4 Made Easy. California: Osborne McGraw Hill, 1992.
Dyfyniad MLAJensen, Cary, and Loy Anderson. Pal for Paradox 4 Made Easy. Osborne McGraw Hill, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.