APA

Buol S. W., Hole F. D. & Mccracken R. J. (1973). Soil genesis and classification. Estados Unidos: The Iowa State University Press.

Chicago

Buol S W, Hole F D and Mccracken R J. 1973. Soil genesis and classification. Estados Unidos: The Iowa State University Press.

Harvard

Buol S. W., Hole F. D. and Mccracken R. J. (1973). Soil genesis and classification. Estados Unidos: The Iowa State University Press.

MLA

Buol S W, Hole F D and Mccracken R J. Soil genesis and classification. Estados Unidos: The Iowa State University Press. 1973.