APA (7th ed.) Citation

Johnson, G. (1973). Profitable pig farming (4th rev.ed.). Farming Press.

Chicago Style (17th ed.) Citation

Johnson, Geoffrey. Profitable Pig Farming. 4th rev.ed. London: Farming Press, 1973.

MLA (9th ed.) Citation

Johnson, Geoffrey. Profitable Pig Farming. 4th rev.ed. Farming Press, 1973.