APA

Witters J., Cammarata K., . (1994). When the Earth Was Bare. New York: SRA / McGraw-Hill.

Chicago

Witters Judith, Cammarata Kathleen, . 1994. When the Earth Was Bare. New York: SRA / McGraw-Hill.

Harvard

Witters J., Cammarata K., . (1994). When the Earth Was Bare. New York: SRA / McGraw-Hill.

MLA

Witters Judith, Cammarata Kathleen, . When the Earth Was Bare. New York: SRA / McGraw-Hill. 1994.