APA

Kiger R. W., Jacobsen T. D. & Lilly R. M. (1981). International register of specialists and current research in plant systematics. Pittsburgh: Hunt Institute for Botanical Documentation, Carnegie-Mellon University.

Chicago

Kiger Robert W, Jacobsen T D and Lilly Roberta M. 1981. International register of specialists and current research in plant systematics. Pittsburgh: Hunt Institute for Botanical Documentation, Carnegie-Mellon University.

Harvard

Kiger R. W., Jacobsen T. D. and Lilly R. M. (1981). International register of specialists and current research in plant systematics. Pittsburgh: Hunt Institute for Botanical Documentation, Carnegie-Mellon University.

MLA

Kiger Robert W, Jacobsen T D and Lilly Roberta M. International register of specialists and current research in plant systematics. Pittsburgh: Hunt Institute for Botanical Documentation, Carnegie-Mellon University. 1981.