Cita APA (7a ed.)

Whittington,H.B. (1971). Silurian calymenid trilobites from the United States,Norway and Sweden. Palaeontological Association.

Cita Chicago Style (17a ed.)

Whittington,H.B. Silurian Calymenid Trilobites from the United States,Norway and Sweden. London - INGL: Palaeontological Association, 1971.

Cita MLA (8a ed.)

Whittington,H.B. Silurian Calymenid Trilobites from the United States,Norway and Sweden. Palaeontological Association, 1971.