useful links

1. Books and Monographs

1. Project Gutenberg
2. Oxford University Press
3. University of California Press
4. PDF Drive

2. Digital Libraries

1. National Digital Library
2. Hathi Trust Digital Library
3. Internet Archive
4. World Digital Library

3. Electronic thesis and dissertation

1. ShodhGanga, India
2. ShodhGangotri, India
3. Networked Digital Library of Theses & Dissertations
4. Open Access Theses & Dissertations (OATD)
5. DiVA Portal
6. EBSCO Open Dissertations

4. Architectural resources

1. Archnet
2. RIBAPix
3. Archdaily
4. Asian Historical Architecture
5. McGraw Hill Construction Network for Products (Sweets catalogue)
6. Pritzker Architecture Prize