APA (7e ed.) Bronvermelding

Não informado. (1970). Laitsch Herbarium Publication. Youngstown State University.

Chicago (17e ed.) Bronvermelding

Não informado. Laitsch Herbarium Publication. Youngstown, Ohio: Youngstown State University, 1970.

MLA (8e ed.) Bronvermelding

Não informado. Laitsch Herbarium Publication. Youngstown State University, 1970.

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