APA (7th ed.) Citation

Grupo Quercus. (1991). Geologa. Erein.

Chicago Style (17th ed.) Citation

Grupo Quercus. Geologa. [San SebastiÆn]: Erein, 1991.

MLA (9th ed.) Citation

Grupo Quercus. Geologa. Erein, 1991.

Warning: These citations may not always be 100% accurate.