Cita APA (7a ed.)

(1987). The New Encyclopaedia Britannica Volume 19 [Excretion and excretory system]. The University of Chicago.

Cita Chicago Style (17a ed.)

The New Encyclopaedia Britannica Volume 19 [Excretion and Excretory System]. The University of Chicago, 1987.

Cita MLA (8a ed.)

The New Encyclopaedia Britannica Volume 19 [Excretion and Excretory System]. The University of Chicago, 1987.