APA (7th ed.) Citation

Green, R. N., Trowbridge, R. L., & Klinka, K. (1993). Towards a taxonomic classification of humus forms. Society of American Foresters.

Chicago Style (17th ed.) Citation

Green, R. N., R. L. Trowbridge, and K. Klinka. Towards a Taxonomic Classification of Humus Forms. Bethesda, Md.: Society of American Foresters, 1993.

MLA (9th ed.) Citation

Green, R. N., et al. Towards a Taxonomic Classification of Humus Forms. Society of American Foresters, 1993.