Dyfyniad APA
Koontz, D. R. (1990). The bad place (1st American ed.). G.P. Putnam's Sons.
Dyfyniad Arddull Chicago
Koontz, Dean R. The Bad Place. 1st American ed. New York: G.P. Putnam's Sons, 1990.
Dyfyniad MLA
Koontz, Dean R. The Bad Place. 1st American ed. G.P. Putnam's Sons, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.