1. Geology of petroleum;Levorsen,1956
2. Geology of petroleum;Levorsen,1967
3. Petroleum formation and occurrence;Tissot,1984
4. Petroleum geochemistry and geology;Hunt,1979
5. Nonmarine origin of petroleum in North Shensi, and the Cretaceous of Szechuan, China;Pan;AAPG bulletin,1941