Dyfyniad APA

Hampel, C. A., & Hawley, G. G. (1973). encyclopaedia of chemistry (3rd ed.). Van Nostrand Reinhold Company.

Dyfyniad Arddull Chicago

Hampel, Clifford A., and Gessner G. Hawley. Encyclopaedia of Chemistry. 3rd ed. New York: Van Nostrand Reinhold Company, 1973.

Dyfyniad MLA

Hampel, Clifford A., and Gessner G. Hawley. Encyclopaedia of Chemistry. 3rd ed. Van Nostrand Reinhold Company, 1973.

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