Dyfyniad APA

Peccei, A., Ikeda, D., & Gage, R. L. (1984). Before it is too late. Kodansha International.

Dyfyniad Arddull Chicago

Peccei, Aurelio, Daisaku Ikeda, and Richard L. Gage. Before It Is Too Late. Tokyo: Kodansha International, 1984.

Dyfyniad MLA

Peccei, Aurelio, et al. Before It Is Too Late. Kodansha International, 1984.

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