Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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