APA (7a ed.)

Weissberger, A., Ambler, C. M., Broughton, G., Craig, L. C., Cummins, A. B., Hutto, F. B. J., Jones, A. L., Kammermeyer, K., Keith, F. W. J., Macwilliam, E., Scheibel, E. G., Stauffer, R. E., & Tipson, R. S. (1956). Separation and purification. Technique of Organic Chemistry.