APA-ийн эшлэл(7 дахь хэвлэлт)
Environmental Law Institute & ebrary, Inc. (1999). Protecting Delaware's natural heritage: Tools for biodiversity conservation. Environmental Law Institute.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Environmental Law Institute ба Inc ebrary. Protecting Delaware's Natural Heritage: Tools for Biodiversity Conservation. Washington, D.C.: Environmental Law Institute, 1999.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Environmental Law Institute ба Inc ebrary. Protecting Delaware's Natural Heritage: Tools for Biodiversity Conservation. Environmental Law Institute, 1999.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.