APA

Holmgren P. K., Holmgren N. H., Barnett L. C., International Association for Plant Taxonomy & New York Botanical Garden. (1990). Index Herbariorum. Part I: The Herbaria of the world. New York: International Association for Plant Taxonomy by New York Botanical Garden.

Chicago

Holmgren Patricia K, Holmgren Noel H.ed, Barnett Lisa C.ed, International Association for Plant Taxonomy and New York Botanical Garden. 1990. Index Herbariorum. Part I: The Herbaria of the world. New York: International Association for Plant Taxonomy by New York Botanical Garden.

Harvard

Holmgren P. K., Holmgren N. H., Barnett L. C., International Association for Plant Taxonomy and New York Botanical Garden. (1990). Index Herbariorum. Part I: The Herbaria of the world. New York: International Association for Plant Taxonomy by New York Botanical Garden.

MLA

Holmgren Patricia K, Holmgren Noel H.ed, Barnett Lisa C.ed, International Association for Plant Taxonomy and New York Botanical Garden. Index Herbariorum. Part I: The Herbaria of the world. New York: International Association for Plant Taxonomy by New York Botanical Garden. 1990.