APA

Gentry A. H., . (1993). A field guide to the families and genera of woody plants of northwest South America (Colombia, Ecuador, Peru), with supplementary notes on herbaceous taxa. Washington: Conservation International.

Chicago

Gentry Alwyn H, . 1993. A field guide to the families and genera of woody plants of northwest South America (Colombia, Ecuador, Peru), with supplementary notes on herbaceous taxa. Washington: Conservation International.

Harvard

Gentry A. H., . (1993). A field guide to the families and genera of woody plants of northwest South America (Colombia, Ecuador, Peru), with supplementary notes on herbaceous taxa. Washington: Conservation International.

MLA

Gentry Alwyn H, . A field guide to the families and genera of woody plants of northwest South America (Colombia, Ecuador, Peru), with supplementary notes on herbaceous taxa. Washington: Conservation International. 1993.