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scribd.com

Get to the source. Specialized knowledge on any topic, and answers you won’t find anywhere else. Home to the world’s documents, 300M+ and counting.

noor-book.com

it is a digital library for arabic e books that contains thousands of books in all fields in pdf doc format and allows authors to publish books on the internet and is considered an electronic publishing house

goodreads.com

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researchgate.net

Access 160+ million publication pages and connect with 25+ million researchers. Join for free and gain visibility by uploading your research.

link.springer.com

providing access to millions of research articles and chapters from science, technology and medicine, and humanities and social sciences

sciencedirect.com

sciencedirect is the world's leading source for scientific, technical, and medical research. explore journals, books and articles.

mdpi.com

MDPI is a publisher of peer-reviewed, open access journals since its establishment in 1996.

onlinelibrary.wiley.com

one of the largest and most authoritative collections of online journals, books, and research resources, covering life, health, social, and physical sciences.

tandfonline.com

search and explore the millions of quality, peer-reviewed journal articles published under the taylor & francis and routledge imprints.

journals.sagepub.com

subscription and open access journals from sage publishing, the world's leading independent academic publisher.