Dyfyniad APA

World book. (1996). World book encyclopedia(vol.22.): :research guide. World book international.

Dyfyniad Arddull Chicago

World book. World Book Encyclopedia(vol.22.): :research Guide. London: World book international, 1996.

Dyfyniad MLA

World book. World Book Encyclopedia(vol.22.): :research Guide. World book international, 1996.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.