APA (7th ed.) Citation

Gray, N. H., & Langenheim Jr., R. (1994). Books for geoscientists. Journal of Geological Education, 42(4), 395.

Chicago Style (17th ed.) Citation

Gray, Norman H., and R.L Langenheim Jr. "Books for Geoscientists." Journal of Geological Education 42, no. 4 (1994): 395.

MLA (9th ed.) Citation

Gray, Norman H., and R.L Langenheim Jr. "Books for Geoscientists." Journal of Geological Education, vol. 42, no. 4, 1994, p. 395.