Ford, J. P. (1985). Geologic history of the Pettet Zone of the Sligo formation at Lisbon Field, Claiborne Parish, Louisiana. [publisher not identified].
Chicago Style (17th ed.) CitationFord, James Patrick. Geologic History of the Pettet Zone of the Sligo Formation at Lisbon Field, Claiborne Parish, Louisiana. [Place of publication not identified]: [publisher not identified], 1985.
MLA (9th ed.) CitationFord, James Patrick. Geologic History of the Pettet Zone of the Sligo Formation at Lisbon Field, Claiborne Parish, Louisiana. [publisher not identified], 1985.
Warning: These citations may not always be 100% accurate.