Cita APA

Krutch, J. W., & Landacre, P. (1956). The great chain of life. Boston, MA: Houghton Mifflin.

Chicago Style Citation

Krutch, Joseph Wood, i Paul Landacre. The Great Chain of Life. Boston, MA: Houghton Mifflin, 1956.

Cita MLA

Krutch, Joseph Wood, i Paul Landacre. The Great Chain of Life. Boston, MA: Houghton Mifflin, 1956.

Atenció: Aquestes cites poden no estar 100% correctes.