Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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