American Institute of Professional Geologists. (1979). The Professional geologist. American Institute of Professional Geologists.
Cytowanie według stylu Chicago (wyd. 17)American Institute of Professional Geologists. The Professional Geologist. [Golden, Colo.]: American Institute of Professional Geologists, 1979.
Cytowanie według stylu MLA (wyd. 9)American Institute of Professional Geologists. The Professional Geologist. American Institute of Professional Geologists, 1979.
Uwaga: Te cytaty mogą odróżniać się od wytycznej twojego fakultetu..