APA

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

Chicago

Ahrens L H, . 1965. Distribution of the elements in our planet. New York: McGraw-Hill.

Harvard

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

MLA

Ahrens L H, . Distribution of the elements in our planet. New York: McGraw-Hill. 1965.