Tohutoro APA (7th ed.)

Fortey, R. A., & Bruton, D. L. (2013). Lower Ordovician trilobites of the Kirtonryggen Formation, Spitsbergen. Wiley Blackwell.

Tohutoru Kātū Chicago (17th ed.)

Fortey, Richard A., me David L. Bruton. Lower Ordovician Trilobites of the Kirtonryggen Formation, Spitsbergen. Hoboken, New Jersey: Wiley Blackwell, 2013.

Tohutoro MLA (9th ed.)

Fortey, Richard A., me David L. Bruton. Lower Ordovician Trilobites of the Kirtonryggen Formation, Spitsbergen. Wiley Blackwell, 2013.