APA-Zitierstil (7. Ausg.)

Ludvigsen, R., Westrop, S. R., & Kindle, C. H. (1989). Sunwaptan (Upper Cambrian) trilobites of the Cow Head Group, western Newfoundland, Canada. Canadian Soc. of Petroleum Geologists u.a.

Chicago-Zitierstil (17. Ausg.)

Ludvigsen, Rolf, Stephen R. Westrop, und Cecil H. Kindle. Sunwaptan (Upper Cambrian) Trilobites of the Cow Head Group, Western Newfoundland, Canada. Calgary, Alberta u.a: Canadian Soc. of Petroleum Geologists u.a, 1989.

MLA-Zitierstil (9. Ausg.)

Ludvigsen, Rolf, et al. Sunwaptan (Upper Cambrian) Trilobites of the Cow Head Group, Western Newfoundland, Canada. Canadian Soc. of Petroleum Geologists u.a, 1989.