APA (7th ed.) Citation

Howard, R. H. (1964). Niagaran reefs and oil accumulation in the DeWitt-McLean County area, Illinois. [publisher not identified].

Chicago Style (17th ed.) Citation

Howard, Richard Henry. Niagaran Reefs and Oil Accumulation in the DeWitt-McLean County Area, Illinois. Urbana: [publisher not identified], 1964.

MLA (9th ed.) Citation

Howard, Richard Henry. Niagaran Reefs and Oil Accumulation in the DeWitt-McLean County Area, Illinois. [publisher not identified], 1964.

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