Παραπομπή σε μορφή APA (7η εκδ.)

Não informado. (1929). Butler University botanical studies. Butler University, Department of Botany.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Não informado. Butler University Botanical Studies. Indianapolis, Ind: Butler University, Department of Botany, 1929.

Παραπομπή σε μορφή MLA (8th εκδ.)

Não informado. Butler University Botanical Studies. Butler University, Department of Botany, 1929.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.