Wikipedia page about this book: https://en.wikipedia.org/wiki/Will_and_Testament_of_%CA%BBAbdu%27l-Bah%C3%A1

Release date is 2006-09-18

"The Will And Testament of 'Abdu'l-Bahá" by ʻAbdu'l-Bahá is a foundational document written in three stages, with the first section probably written in 1906. Composed under imminent threat of harm, this seminal text establishes key structures of Baháʼí administration and appoints Shoghi Effendi as Guardian. It addresses fundamental teachings of love and unity, discusses threats to the Covenant, and defines the institutions of the Guardianship and Universal House of Justice, shaping the future governance of the Baháʼí Faith. (This is an automatically generated summary.)

Original publication data not identified