APA (7. basım) Alıntı

Gray, W. K. (1968). The economy of west central region of South Dakota.

Chicago Style (17. basım) Atıf

Gray, Walter K. The Economy of West Central Region of South Dakota. Vermillion, South Dakota, Business Research Bureau, School of Business, Univ. of South Dakota, 1968.

MLA (9th ed.) Atıf

Gray, Walter K. The Economy of West Central Region of South Dakota. 1968.