APA

Prance G. T., Elias T. S. & New York Botanical Garden. (1977). Extinction is forever: threatened and endangered species of plants in the Americas and their significance in ecosystems today and in the future : proceedings of a symposium held at the New York Botanical Garden, May 11-13, 1976, in commemoration of the Bicentennial of the United States of America. Bronx, N.Y: New York Botanical Garden.

Chicago

Prance Ghillean T, Elias Thomas S and New York Botanical Garden. 1977. Extinction is forever: threatened and endangered species of plants in the Americas and their significance in ecosystems today and in the future : proceedings of a symposium held at the New York Botanical Garden, May 11-13, 1976, in commemoration of the Bicentennial of the United States of America. Bronx, N.Y: New York Botanical Garden.

Harvard

Prance G. T., Elias T. S. and New York Botanical Garden. (1977). Extinction is forever: threatened and endangered species of plants in the Americas and their significance in ecosystems today and in the future : proceedings of a symposium held at the New York Botanical Garden, May 11-13, 1976, in commemoration of the Bicentennial of the United States of America. Bronx, N.Y: New York Botanical Garden.

MLA

Prance Ghillean T, Elias Thomas S and New York Botanical Garden. Extinction is forever: threatened and endangered species of plants in the Americas and their significance in ecosystems today and in the future : proceedings of a symposium held at the New York Botanical Garden, May 11-13, 1976, in commemoration of the Bicentennial of the United States of America. Bronx, N.Y: New York Botanical Garden. 1977.