Wyon, J. B., & Gordon, J. E. (1971). The Khanna study: Population problems in the rural Punjab. Harvard University Press.

Wyon, J. B., and John Everett Gordon. The Khanna Study: Population Problems in the Rural Punjab. Cambridge, Mass.: Harvard University Press, 1971.

Wyon, J. B., and John Everett Gordon. The Khanna Study: Population Problems in the Rural Punjab. Harvard University Press, 1971.