APA (7th ed.) Citation

Spencer, H. (1898). The principles of biology (Rev. and enl. ed. ..). D. Appleton and company.

Chicago Style (17th ed.) Citation

Spencer, Herbert. The Principles of Biology. Rev. and enl. ed. .. New York: D. Appleton and company, 1898.

MLA (9th ed.) Citation

Spencer, Herbert. The Principles of Biology. Rev. and enl. ed. .. D. Appleton and company, 1898.