APA (7th ed.) Citation

Marx, K., Engels, F., & Parsons, H. L. (1977). Marx and Engels on ecology. Greenwood Press.

Chicago Style (17th ed.) Citation

Marx, Karl, Friedrich Engels, and Howard L. Parsons. Marx and Engels on Ecology. Westport, Conn.: Greenwood Press, 1977.

MLA (9th ed.) Citation

Marx, Karl, et al. Marx and Engels on Ecology. Greenwood Press, 1977.