Legal restrictions on hours of work in the United States : a reference manual.

MLA

National Industrial Conference Board. Legal restrictions on hours of work in the United States : a reference manual. New York : National Industrial Conference Board, [1924]

APA

National Industrial Conference Board. (1924). Legal restrictions on hours of work in the United States : a reference manual. New York : National Industrial Conference Board.

Chicago

National Industrial Conference Board. Legal restrictions on hours of work in the United States : a reference manual. New York : National Industrial Conference Board, [1924]