APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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