Burger, W. C. (1967). Families of flowering plants in Ethiopia: An introduction with keys for the identification of the families of flowering plants and gymnosperms found in Ethiopia and adjacent areas of Eastern Africa. Oklahoma State Univ. Pr.
Chicago-Zitierstil (17. Ausg.)Burger, William C. Families of Flowering Plants in Ethiopia: An Introduction with Keys for the Identification of the Families of Flowering Plants and Gymnosperms Found in Ethiopia and Adjacent Areas of Eastern Africa. Stillwater, Okla: Oklahoma State Univ. Pr, 1967.
MLA-Zitierstil (9. Ausg.)Burger, William C. Families of Flowering Plants in Ethiopia: An Introduction with Keys for the Identification of the Families of Flowering Plants and Gymnosperms Found in Ethiopia and Adjacent Areas of Eastern Africa. Oklahoma State Univ. Pr, 1967.