APA

Holmgren P. K., . (1971). A biosystematic study of North American thlaspi montanum and its allies. Bronx, New York: The New York Botanical Garden.

Chicago

Holmgren Patricia K, . 1971. A biosystematic study of North American thlaspi montanum and its allies. Bronx, New York: The New York Botanical Garden.

Harvard

Holmgren P. K., . (1971). A biosystematic study of North American thlaspi montanum and its allies. Bronx, New York: The New York Botanical Garden.

MLA

Holmgren Patricia K, . A biosystematic study of North American thlaspi montanum and its allies. Bronx, New York: The New York Botanical Garden. 1971.