Cita APA (7a ed.)

Krutch, J. W., & Landacre, P. (1957). The great chain of life. Houghton Mifflin.

Cita Chicago Style (17a ed.)

Krutch, Joseph Wood, y Paul Landacre. The Great Chain of Life. Boston: Houghton Mifflin, 1957.

Cita MLA (9a ed.)

Krutch, Joseph Wood, y Paul Landacre. The Great Chain of Life. Houghton Mifflin, 1957.