APA (7th ed.) Zitazioa

JOHNSON Leon J. (1979). Introductory soil science: A study guide and laboratory manual. Macmillan.

Chicago Style (17th ed.) Zitazioa

JOHNSON Leon J. Introductory Soil Science: A Study Guide and Laboratory Manual. New York: Macmillan, 1979.

MLA (9th ed.) Zitazioa

JOHNSON Leon J. Introductory Soil Science: A Study Guide and Laboratory Manual. Macmillan, 1979.