O’HARA, A. 1999. A practical guide to gas contracting. Tulsa, OK: PennWell Books.
APA (7th ed.) CitationO’Hara, A. (1999). A practical guide to gas contracting. PennWell Books.
Chicago Style (17th ed.) CitationO’Hara, Ann. A Practical Guide to Gas Contracting. Tulsa, OK: PennWell Books, 1999.
MLA (9th ed.) CitationO’Hara, Ann. A Practical Guide to Gas Contracting. PennWell Books, 1999.
Warning: These citations may not always be 100% accurate.
