Não informado. (1929). Butler University botanical studies. Butler University, Department of Botany.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Butler University Botanical Studies. Indianapolis, Ind: Butler University, Department of Botany, 1929.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Butler University Botanical Studies. Butler University, Department of Botany, 1929.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.