worldcat.org 的前十大競爭對手

proquest.com

proquest powers research in academic, corporate, government, public and school libraries around the world with unique content. explore millions of resources from scholarly journals, books, newspapers, videos and more.

heinonline.org

The first comprehensive database of its kind in a fully searchable format, HeinOnline’s Immigration Law & Policy in the U.S. compiles the most important historical documents and legislation related to immigration in the United States.

openlibrary.org

open library is an open, editable library catalog, building towards a web page for every book ever published. read, borrow, and discover more than 3m books for free.

wikihow.com

You want to meet people, make friends, and share yourself with the world, but social interactions can be especially intimidating for people who struggle with social anxiety. While many people feel nervous before a presentation or speaking...

rapidtables.com

Notepad online free app.

wikidata.org

quotation supporting the statement claim (to be used in the reference or qualifier field only, no quote marks)

sciencedirect.com

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

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

citethisforme.com

automatic works cited and bibliography formatting for mla, apa and chicago/turabian citation styles. now supports 7th edition of mla.