International Union for Conservation of Nature and Natural Resources. (1999). Conifers. IUCN.
Cita Chicago Style (17a ed.)International Union for Conservation of Nature and Natural Resources. Conifers. Switzerland: IUCN, 1999.
Cita MLA (9a ed.)International Union for Conservation of Nature and Natural Resources. Conifers. IUCN, 1999.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.