APA

Davidson J., Lloyd R., . (1977). Conservation and agriculture. New York: John Wiley & Sons.

Chicago

Davidson Joan, Lloyd Richard, . 1977. Conservation and agriculture. New York: John Wiley & Sons.

Harvard

Davidson J., Lloyd R., . (1977). Conservation and agriculture. New York: John Wiley & Sons.

MLA

Davidson Joan, Lloyd Richard, . Conservation and agriculture. New York: John Wiley & Sons. 1977.