APA

Bushnell G. H. S., . (1968). The first Americans: the pre-Columbian civilizations. New York: McGraw-Hill.

Chicago

Bushnell Geoffrey Hext Sutherland, . 1968. The first Americans: the pre-Columbian civilizations. New York: McGraw-Hill.

Harvard

Bushnell G. H. S., . (1968). The first Americans: the pre-Columbian civilizations. New York: McGraw-Hill.

MLA

Bushnell Geoffrey Hext Sutherland, . The first Americans: the pre-Columbian civilizations. New York: McGraw-Hill. 1968.