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| 1- Google Scholar | |||
| 2- ERIC | |||
| 3- The Virtual LRC | |||
| 4- z-lib.org | |||
| 5- JURN | |||
| 6- Microsoft Academic | |||
| 7- Library of Congress | |||
| 8- Cite SeerX | |||
| 9- Refseek | |||
| 10- Science Direct | |||
| 11- free-ebooks.net | |||
| 12- manybooks.net |
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