Richberg, D. R. (1957). Labor union monopoly: A clear and present danger / by Donald R. Richberg (2. print.). Regnery.
Chicago (17e ed.) BronvermeldingRichberg, Donald Randall. Labor Union Monopoly: A Clear and Present Danger / by Donald R. Richberg. 2. print. Chicago: Regnery, 1957.
MLA (8e ed.) BronvermeldingRichberg, Donald Randall. Labor Union Monopoly: A Clear and Present Danger / by Donald R. Richberg. 2. print. Regnery, 1957.
Let op: Deze citaties zijn niet altijd 100% accuraat.