Franklin

MLA

Frain, Hummel La Rue. An Examination of Earnings In Certain Standard Machine-tool Occupations In Philadelphia. Philadelphia: University of Pennsylvania press, 1929.

APA

Frain, H. La Rue. (1929). An examination of earnings in certain standard machine-tool occupations in Philadelphia. Philadelphia: University of Pennsylvania press.

Chicago

Frain, Hummel La Rue. An Examination of Earnings In Certain Standard Machine-Tool Occupations In Philadelphia. Philadelphia: University of Pennsylvania press, 1929.