Kravis, I. B., Heston, A. W., Summers, R., United Nations. Statistical Office., & World Bank. (1982). World product and income: International comparisons of real gross product. Baltimore: Published for the World Bank [by] the Johns Hopkins University Press.

Kravis, Irving B., Alan W. Heston, Robert Summers, United Nations. Statistical Office, and World Bank. World Product and Income: International Comparisons of Real Gross Product. Baltimore: Published for the World Bank [by] the Johns Hopkins University Press, 1982.

Kravis, Irving B., et al. World Product and Income: International Comparisons of Real Gross Product. Baltimore: Published for the World Bank [by] the Johns Hopkins University Press, 1982.