APA (7th ed.) Citation

Giddens, P. H. (1941). The beginnings of the petroleum industry: Sources and bibliography. Pennsylvania Historical Commission.

Chicago Style (17th ed.) Citation

Giddens, Paul Henry. The Beginnings of the Petroleum Industry: Sources and Bibliography. Harrisburg: Pennsylvania Historical Commission, 1941.

MLA (8th ed.) Citation

Giddens, Paul Henry. The Beginnings of the Petroleum Industry: Sources and Bibliography. Pennsylvania Historical Commission, 1941.

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