Chronica Botanica , 1945
Buku Teks
Duke, James A., author
CRC Press, Taylor & Francis Group, 2009
Buku Referensi
Bold, Harold Charles, 1909-, author
Harper & Row, 1987
Buku Teks
Jacobs, William P., author
Cambridge University Press , 1979
Buku Teks
by Michael G. Barbour ... [and others]
An Imprint of Addison Wesley Longman , 1998
Buku Teks