APA (7th ed.) Citation

Ramann, E., & Whittles, C. L. (1928). The evolution and classification of soils. W. Heffer.

Chicago Style (17th ed.) Citation

Ramann, E., and C. L. Whittles. The Evolution and Classification of Soils. Cambridge: W. Heffer, 1928.

MLA (9th ed.) Citation

Ramann, E., and C. L. Whittles. The Evolution and Classification of Soils. W. Heffer, 1928.