APA (7th ed.) Citation

Knechtel, M. M. (1949). Geology and coal and natural gas resources of northern Le Flore County, Oklahoma. [publisher not identified].

Chicago Style (17th ed.) Citation

Knechtel, Maxwell McMichael. Geology and Coal and Natural Gas Resources of Northern Le Flore County, Oklahoma. Norman: [publisher not identified], 1949.

MLA (8th ed.) Citation

Knechtel, Maxwell McMichael. Geology and Coal and Natural Gas Resources of Northern Le Flore County, Oklahoma. [publisher not identified], 1949.