National Botanic Garden of Belgium\nNationale Plantentuin van België. (1999). Systematics and Geography of Plants. National Botanic Gardens.
Citação do estilo Chicago (17ª ed.)National Botanic Garden of Belgium\nNationale Plantentuin van België. Systematics and Geography of Plants. Meise, Belgica: National Botanic Gardens, 1999.
Citação MLA (8ª ed.)National Botanic Garden of Belgium\nNationale Plantentuin van België. Systematics and Geography of Plants. National Botanic Gardens, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.