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Al-Islam.org is a site which gathers many sources. Some of them are reliable and are not. In every case we should check the auther. For example A Study in the Philosophy of Islamic Rites is written by Muhammad Baqir al-Sadr who is authentic in that field. Fatima is Fatima  is written by Ali Shariati who is not authentic in the field. Furthermore you can use Google book, Amazon, etc to find the more informatio about publisher, author, etc. So we can't judge about the site which is collecting sources from different authors in general.(t-c) "