Dyfyniad APA

Romey, W. D., & Boyer, R. E. (1971). Field guide to plutonic and metamorphic rocks. Houghton Mifflin.

Dyfyniad Arddull Chicago

Romey, William D., and Robert E. Boyer. Field Guide to Plutonic and Metamorphic Rocks. Boston: Houghton Mifflin, 1971.

Dyfyniad MLA

Romey, William D., and Robert E. Boyer. Field Guide to Plutonic and Metamorphic Rocks. Houghton Mifflin, 1971.

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