APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.