Dyfyniad APA

Stern, J. P., & Joy P. Stern; Edward S. Stern. (1971). Petrochemicals today. London: E. Arnold.

Dyfyniad Arddull Chicago

Stern, Joy P., và Joy P. Stern; Edward S. Stern. Petrochemicals Today. London: E. Arnold, 1971.

Dyfyniad MLA

Stern, Joy P., và Joy P. Stern; Edward S. Stern. Petrochemicals Today. London: E. Arnold, 1971.

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