APA (7th ed.) Citation

Jones, J. O., & Jones, E. A. (1974). Index of human ecology. Europa.

Chicago Style (17th ed.) Citation

Jones, J. O., and E. A. Jones. Index of Human Ecology. London: Europa, 1974.

MLA (8th ed.) Citation

Jones, J. O., and E. A. Jones. Index of Human Ecology. Europa, 1974.