APA

Bednar G. A., Collier C. R. & Cross W. P. (1968). Analysis of water quality of the Mahoning River in Ohio. Washington, D.C: U.S. Gov. Print. Off.

Chicago

Bednar Gene A, Collier Charles R and Cross William P. 1968. Analysis of water quality of the Mahoning River in Ohio. Washington, D.C: U.S. Gov. Print. Off.

Harvard

Bednar G. A., Collier C. R. and Cross W. P. (1968). Analysis of water quality of the Mahoning River in Ohio. Washington, D.C: U.S. Gov. Print. Off.

MLA

Bednar Gene A, Collier Charles R and Cross William P. Analysis of water quality of the Mahoning River in Ohio. Washington, D.C: U.S. Gov. Print. Off. 1968.