APA (7th ed.) Citation

Unzer, J. A., Laycock, T., & Prochaska, G. (1851). The principles of physiology. Syndenham Society.

Chicago Style (17th ed.) Citation

Unzer, Johann August, Thomas Laycock, and Georg Prochaska. The Principles of Physiology. London: Syndenham Society, 1851.

MLA (8th ed.) Citation

Unzer, Johann August, et al. The Principles of Physiology. Syndenham Society, 1851.