APA

Barnett L. C., Holmgren N. H., Holmgren P. K., International Association for Plant Taxonomy & New York Botanical Garden. (1990). Index Herbariorum. New York: International Association for Plant Taxonomy by New York Botanical Garden.

Chicago

Barnett Lisa C, Holmgren Noel H, Holmgren Patricia K, International Association for Plant Taxonomy and New York Botanical Garden. 1990. Index Herbariorum. New York: International Association for Plant Taxonomy by New York Botanical Garden.

Harvard

Barnett L. C., Holmgren N. H., Holmgren P. K., International Association for Plant Taxonomy and New York Botanical Garden. (1990). Index Herbariorum. New York: International Association for Plant Taxonomy by New York Botanical Garden.

MLA

Barnett Lisa C, Holmgren Noel H, Holmgren Patricia K, International Association for Plant Taxonomy and New York Botanical Garden. Index Herbariorum. New York: International Association for Plant Taxonomy by New York Botanical Garden. 1990.