Encyclopedia of Religion and Nature [PRINT] by 
The Oxford Handbook of Religion and Ecology [ONLINE & PRINT] by 
The Wiley Blackwell Companion to Religion and Ecology [ONLINE] by 
Routledge Handbook of Religion and Ecology [ONLINE & PRINT] by Oxford Bibliographies entry on Religion and Ecology
Click on the link above to view the bibliography (a list of writings by a particular author or publisher, or on a specific subject).
Oxford Bibliographies, compiled by scholars and librarians, contain extensive lists of annotated titles on many topics in a wide range of disciplines.
Each entry provides an introduction to a topic and a list of key books and articles. Keep in mind that these entries provide an overview of a given topic at a particular point in time. While they are a great way to start your research and find authoritative sources on a topic, you'll likely need to do further research to get a deeper and more comprehensive understanding of the topic.