APA (7th ed.) Citation

Singer, H. W., & Ansari, J. A. (1977). Rich and poor countries. Allen & Unwin.

Chicago Style (17th ed.) Citation

Singer, Hans W., and Javed A. Ansari. Rich and Poor Countries. London: Allen & Unwin, 1977.

MLA (9th ed.) Citation

Singer, Hans W., and Javed A. Ansari. Rich and Poor Countries. Allen & Unwin, 1977.