APA

Northrup H. R., Wharton School, . (1968). The Negro in the aerospace industry. Philadelphia: Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press.

Chicago

Northrup Herbert Roof, Wharton School, . 1968. The Negro in the aerospace industry. Philadelphia: Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press.

Harvard

Northrup H. R., Wharton School, . (1968). The Negro in the aerospace industry. Philadelphia: Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press.

MLA

Northrup Herbert Roof, Wharton School, . The Negro in the aerospace industry. Philadelphia: Industrial Research Unit, Wharton School of Finance and Commerce, University of Pennsylvania; distributed by University of Pennsylvania Press. 1968.