Cita APA (7a ed.)

Webby, B. D. (1981). The ORDOVICIAN system in Australia, New Zeland and Antartica: Correlation charts and explanatory notes. IUGS.

Cita Chicago Style (17a ed.)

Webby, B. D. The ORDOVICIAN System in Australia, New Zeland and Antartica: Correlation Charts and Explanatory Notes. Ottawa, Canadá: IUGS, 1981.

Cita MLA (8a ed.)

Webby, B. D. The ORDOVICIAN System in Australia, New Zeland and Antartica: Correlation Charts and Explanatory Notes. IUGS, 1981.