Books about the Baha'i faith by non-Baha'i writers

By a Christian writer :

https://www.gutenberg.org/files/36585/36585-h/36585-h.htm

By Muslim writers :

https://archive.org/details/TwelvePrinciples

By Zoroastrian writers (English from Page 150 onwards) :

https://vdocuments.in/zartoshti-ane-bahai-dharm-gujrati.html

By the writers of the Ahmadiyya movement :

https://www.alislam.org/library/books/babi-and-bahai.pdf

By a Hindu writer :

https://web.archive.org/web/20190329165800/http://kitab-i-aqdas.info/

By Orthodox Baha'is :

http://www.bahai-guardian.com/nakhjavani.html

By Dr. Denis MacEoin :

https://www.tandfonline.com/doi/abs/10.1080/13530198708705441

https://www.sciencedirect.com/science/article/abs/pii/0048721X83900222

https://brill.com/display/title/14923

By Prof. Juan Cole :

https://www.h-net.org/~bahai/docs/vol6/salmuhj.htm

By Babi / Azalis :

https://archive.org/details/TheReligionOfTheBayanAndTheClaimsOfTheBahais

By the descendants of Abdul Baha :

https://historyofbahaifaith.files.wordpress.com/2019/02/a-lost-history-of-bahai-faith.pdf

By Badi'u'llah, the son of Baha'u'llah :

http://bayanic.com/notes/memoirs/memoirs.html

By Shaykhi leader Karim khan Kirmani :

https://hurqalya.ucmerced.edu/node/52