Reference books are shelved in a different location than the general collection and can only be used in the library. A Reference book will have the prefix "REF" before its call number.
The Oxford Dictionary of Islam by 
Dictionary of Islamic Architecture by 
Dictionary of Philosophy and Religion by 
Dictionary of Roman Religion by 
Religious Sites in America by 
The Oxford Dictionary of the Jewish Religion by 
Historical Dictionary of the Orthodox Church by 
The New Encyclopedia of Islam by 
Encyclopedia of Religion in America by 
Encyclopedia of American Religious History by 
Encyclopedia of Religious Freedom by 
Encyclopedia of Religion in American Politics by 
The Encyclopedia of world faiths: an illustrated survey of the world's living religions by 
Encyclopedia of African American Religions by 
Religions of the World [6 Volumes] by 
