Não informado. (1927). Psychological abstracts. American Psychological Association.
Chicago (17e ed.) BronvermeldingNão informado. Psychological Abstracts. Lancaster, Pa: American Psychological Association, 1927.
MLA (8e ed.) BronvermeldingNão informado. Psychological Abstracts. American Psychological Association, 1927.
Let op: Deze citaties zijn niet altijd 100% accuraat.