Παραπομπή APA

Ahrens, L. H. (1965). Distribution of the elements in our planet. McGraw-Hill.

Παραπομπή Chicago Style

Ahrens, L. H. Distribution of the Elements in Our Planet. New York: McGraw-Hill, 1965.

Παραπομπή MLA

Ahrens, L. H. Distribution of the Elements in Our Planet. McGraw-Hill, 1965.