APA (7th ed.) Citation

LEY, J. d. (1949). Enzyme activity and nitrogen content of E. coli. Nature, 164(4171), 618.

Chicago Style (17th ed.) Citation

LEY, J. de. "Enzyme Activity and Nitrogen Content of E. Coli." Nature 164, no. 4171 (1949): 618.

MLA (9th ed.) Citation

LEY, J. de. "Enzyme Activity and Nitrogen Content of E. Coli." Nature, vol. 164, no. 4171, 1949, p. 618.