Bahá'í Epistemology, by Peter Terry (2004). Statements of Abdu'l-Bahá on the four modes of knowledge: sense perception, reason, tradition, and inspiration. All must defer to the divine standard.
Short Obligatory Prayer in Many Languages, Author unknown, comp. (1981/1986/2016). Three files: Short Obligatory Prayer in 501 languages (as published in Bahá'í World), and in a collection of African languages.