Não informado. (1956). Swimming pool age. [s.n.].
Chicago (17e ed.) BronvermeldingNão informado. Swimming Pool Age. New York: [s.n.], 1956.
MLA (8e ed.) BronvermeldingNão informado. Swimming Pool Age. [s.n.], 1956.
Let op: Deze citaties zijn niet altijd 100% accuraat.