APA

Nielsen D. R., MacDonald J. G., . (1978). Nitrigen in the environment. New York: Academic.

Chicago

Nielsen Donald R, MacDonald J G, . 1978. Nitrigen in the environment. New York: Academic.

Harvard

Nielsen D. R., MacDonald J. G., . (1978). Nitrigen in the environment. New York: Academic.

MLA

Nielsen Donald R, MacDonald J G, . Nitrigen in the environment. New York: Academic. 1978.