The most important 12 serious sites in the affairs of science and culture.

 

refseek site.

A search engine that provides academic resources in an easy way. More than a billion sources from books, magazines, news and encyclopedias ..

RefSeek - Academic Search Engine

* WorldCat website.

An easy-to-use search engine that searches over 20,000 libraries and contains more than 2 billion sources

And you can find the nearest library to you..

The World's Largest Library Catalog

* Springer website.

It contains more than 3 million sources in various scientific fields such as articles, papers, conferences and parts of books.

Home - Springer

* Microsoft_Academic website.

It carries extensive research results, content for academics, and is constantly updated. It contains more than 120 million publications.

Microsoft - Cloud, Computers, Apps & Gaming

* Bioline website.

A voluntary search engine that collects articles published in scientific journals in developing countries such as Egypt, Turkey, Iraq, Jordan and others..

+ Bioline International Official Site (site up-dated regularly)

* EThOS website.

He holds more than 500,000 master's and doctoral theses in all fields.

Search and order these online

* Research Paper's in Economics website.

A search engine that contains more than two million searches in economics and other related sciences.

Research Papers in Economics

* Science.gove website.

A US government scientific search engine that brings together more than 2,000 scientific websites and contains more than 200 million papers and reliable results.

Science.gov: USA.gov for Science

* kotobgy website..

A search engine that contains millions of downloadable Arabic books.

Kutobji - Arabic book search engine.

* pdfdrive website.

The largest and best site to download books in all disciplines in PDF format. It contains more than 225 million books ready for direct download and can be used for study..

PDF Drive - Search and download PDF files for free.

* ISEEK Education website.

An excellent search engine targeting students, teachers, administrators and others that contains reliable materials..

iseek

* base_-search site..

One of the best and most powerful academic research engines, there are more than 100 million scientific documents.. 70% of the articles that are published

BASE (Bielefeld Academic Search Engine): Basic Search