APA (7th ed.) Citation

Helmig, H. M. (1965). The geology of the Valderrueda, Tejerina, Ocejo and Sabero Coal Basins: Cantabrian mountains, Spain. Thesis Univ. Leiden.

Chicago Style (17th ed.) Citation

Helmig, H. M. The Geology of the Valderrueda, Tejerina, Ocejo and Sabero Coal Basins: Cantabrian Mountains, Spain. Leiden: Thesis Univ. Leiden, 1965.

MLA (9th ed.) Citation

Helmig, H. M. The Geology of the Valderrueda, Tejerina, Ocejo and Sabero Coal Basins: Cantabrian Mountains, Spain. Thesis Univ. Leiden, 1965.

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