Cita APA (7a ed.)

Ward, C. H. (1923). Exploring nature. H. Holt and Co.

Cita Chicago Style (17a ed.)

Ward, C. H. Exploring Nature. New York: H. Holt and Co, 1923.

Cita MLA (8a ed.)

Ward, C. H. Exploring Nature. H. Holt and Co, 1923.