APA (7th ed.) Citation

Kjellman, W., Cadling, L., & Flodin, N. (1953). A new geotechnical Classification System.

Chicago Style (17th ed.) Citation

Kjellman, W., Lyman Cadling, and N. Flodin. A New Geotechnical Classification System. Stockholm, 1953.

MLA (9th ed.) Citation

Kjellman, W., et al. A New Geotechnical Classification System. 1953.