Dyfyniad APA

Sheldon, S. (2001). The sky is falling. Compass Press, HarperCollins Publishers.

Dyfyniad Arddull Chicago

Sheldon, Sidney. The Sky Is Falling. London ; Oxford ; Melbourne: Compass Press, HarperCollins Publishers, 2001.

Dyfyniad MLA

Sheldon, Sidney. The Sky Is Falling. Compass Press, HarperCollins Publishers, 2001.

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