APA

International Association for Plant Taxonomy, . (1990). Index herbariorum. Bronx, New York: Published and Distributed for International Association for Plant Taxonomy by New York Botanical Gardens.

Chicago

International Association for Plant Taxonomy, . 1990. Index herbariorum. Bronx, New York: Published and Distributed for International Association for Plant Taxonomy by New York Botanical Gardens.

Harvard

International Association for Plant Taxonomy, . (1990). Index herbariorum. Bronx, New York: Published and Distributed for International Association for Plant Taxonomy by New York Botanical Gardens.

MLA

International Association for Plant Taxonomy, . Index herbariorum. Bronx, New York: Published and Distributed for International Association for Plant Taxonomy by New York Botanical Gardens. 1990.