APA
National Industrial Conference Board, National Industrial Conference Board, . (1956). Productivity in industry. : .
Chicago
National Industrial Conference Board, National Industrial Conference Board, . 1956. Productivity in industry. : .
Harvard
National Industrial Conference Board, National Industrial Conference Board, . (1956). Productivity in industry. : .
MLA
National Industrial Conference Board, National Industrial Conference Board, . Productivity in industry. : . 1956.
