Dyfyniad APA

Cummins, E., & Devyver, F. T. (1947). Labour problem in the United States. N.van nustrand co.

Dyfyniad Arddull Chicago

Cummins, E.E, and Frank T. Devyver. Labour Problem in the United States. London: N.van nustrand co, 1947.

Dyfyniad MLA

Cummins, E.E, and Frank T. Devyver. Labour Problem in the United States. N.van nustrand co, 1947.

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