Παραπομπή APA

Ordway, R. J. (1966). Earth science. Van Nostrand Reinhold Company.

Παραπομπή Chicago Style

Ordway, Richard J. Earth Science. New Delhi: Van Nostrand Reinhold Company, 1966.

Παραπομπή MLA

Ordway, Richard J. Earth Science. Van Nostrand Reinhold Company, 1966.