APA (7th ed.) Citation

Marcus, S. P., & Haeckel, E. (1910). What is this universe?: Christian faith versus monist dreams. Funk and Wagnalls company.

Chicago Style (17th ed.) Citation

Marcus, Sigismund Philipp, and Ernst Haeckel. What Is This Universe?: Christian Faith Versus Monist Dreams. London, New York: Funk and Wagnalls company, 1910.

MLA (8th ed.) Citation

Marcus, Sigismund Philipp, and Ernst Haeckel. What Is This Universe?: Christian Faith Versus Monist Dreams. Funk and Wagnalls company, 1910.