APA (7e ed.) Bronvermelding

Não informado. (1905). Circular. Illinois Engineering Experiment Station.

Chicago (17e ed.) Bronvermelding

Não informado. Circular. Urbana, Ill: Illinois Engineering Experiment Station, 1905.

MLA (8e ed.) Bronvermelding

Não informado. Circular. Illinois Engineering Experiment Station, 1905.

Let op: Deze citaties zijn niet altijd 100% accuraat.