Dyfyniad APA
Weeks, J. R. (1989). Population: An introduction to concepts and issues (4th ed.). Wadsworth Pub. Co..
Dyfyniad Arddull Chicago
Weeks, John Robert. Population: An Introduction to Concepts and Issues. 4th ed. Belmont, Calif.: Wadsworth Pub. Co., 1989.
Dyfyniad MLA
Weeks, John Robert. Population: An Introduction to Concepts and Issues. 4th ed. Wadsworth Pub. Co., 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.