APA (7th ed.) Citation

Pena, R. E. (2008). Lexicon of Philippine stratigraphy. [s.n.].

Chicago Style (17th ed.) Citation

Pena, Rolando E. Lexicon of Philippine Stratigraphy. Mandaluyong: [s.n.], 2008.

MLA (9th ed.) Citation

Pena, Rolando E. Lexicon of Philippine Stratigraphy. [s.n.], 2008.