Cita APA (7a ed.)
Krutch, J. W. The Great Chain of Life. Pyramid Books.
Cita estilo Chicago (17a ed.)
Krutch, Joseph Wood. The Great Chain of Life. Nueva York, EUA: Pyramid Books.
Cita MLA (9a ed.)
Krutch, Joseph Wood. The Great Chain of Life. Pyramid Books.
Precaución: Estas citas no son 100% exactas.