APA (7th ed.) Zitazioa

BUTLER, B. (1980). Soil classification for soil survey.: BUTLER, B.E. Clarendon Pr..

Chicago Style (17th ed.) Zitazioa

BUTLER, B.E. Soil Classification for Soil Survey.: BUTLER, B.E. Oxford: Clarendon Pr., 1980.

MLA (9th ed.) Zitazioa

BUTLER, B.E. Soil Classification for Soil Survey.: BUTLER, B.E. Clarendon Pr., 1980.