International Union for Conservation of Nature and Natural Resources. (1999). Conifers. IUCN.
Style de citation Chicago (17e éd.)International Union for Conservation of Nature and Natural Resources. Conifers. Switzerland: IUCN, 1999.
Style de citation MLA (9e éd.)International Union for Conservation of Nature and Natural Resources. Conifers. IUCN, 1999.
Attention : ces citations peuvent ne pas être correctes à 100%.