APA-Zitierstil (7. Ausg.)

Gregory, J. W. (1921). Catalogue of the fossil Bryozoa in the Department of geology British Museum (natural history). Longmans [u.a.].

Chicago-Zitierstil (17. Ausg.)

Gregory, John W. Catalogue of the Fossil Bryozoa in the Department of Geology British Museum (natural History). London: Longmans [u.a.], 1921.

MLA-Zitierstil (9. Ausg.)

Gregory, John W. Catalogue of the Fossil Bryozoa in the Department of Geology British Museum (natural History). Longmans [u.a.], 1921.