Eurobats: Free magazine about bat conservation and protection.

The EUROBATS Publication Series deals with various aspects of bat conservation - sometimes reporting of the implementation of the EUROBATS Agreement in the Range States, sometimes providing guidance on the best ways to protect bats and their habitats.

Currently there are 5 issues published:

1. 1991 - 2006. EUROBATS celebrates its 15th anniversary
2. Protecting and managing underground sites for bats, 3rd edition
3. Guidelines for consideration of bats in wind farm projects
4. Protection of overground roosts for bats, 2nd edition 
5. Guidelines for Surveillance and Monitoring of European Bats

Source:  EUROBATS

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Bonus link:
3rd Edition Bat Workers' Manual (2004) - Mitchell-Jones, A.J, & McLeish, A.P. Ed.