Halnan, E. T., & Hammond, J. (1950). A course of practical physiology for agricultural students (2nd ed.). University Press.

Halnan, Edward Thomas, and John Hammond. A Course of Practical Physiology for Agricultural Students. 2nd ed. Cambridge: University Press, 1950.

Halnan, Edward Thomas, and John Hammond. A Course of Practical Physiology for Agricultural Students. 2nd ed. University Press, 1950.