Dyfyniad APA

Herring, H. (1975). Guide to environmental resources. Smoothie Publications.

Dyfyniad Arddull Chicago

Herring, Horace. Guide to Environmental Resources. Brighton: Smoothie Publications, 1975.

Dyfyniad MLA

Herring, Horace. Guide to Environmental Resources. Smoothie Publications, 1975.

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