Baha'u'llah, Lawḥ-i-Riḍvánuʼl-ʻAdl, Tablet of the Paradise of Justice, https://adibmasumian.com/translations/lawh-i-ridvanul-adl/
S Ruhe's, Robe of Light: The Persian Years of the Supreme Prophet Bahá'u'lláh,
bio of ruhe: https://bahai-library.com/pdf/h/herrmann_david_ruhe_author.pdf
(Abdu'l-Baha, Mahmud's Diary, vol. 1, p. https://bahai-library.com/zarqani_mahmuds_diary&chapter=1#section1)
Mirza Mahmud Zarqani, Mahmud's Diary, volume two, Abdu'l-Baha in Europe, 1912-1913, translated by Adib Masumian, George Ronald, Oxford, 2024
A Supplement to 'Abdu'l-Bahá in Europe, 1912-1913, Adib Masumian, compiler, 2023, https://bahai-library.org/supplement_abdul-baha_europe_1912-1913
Howard Colby Ives, Portals to Freedom, Oxford: George Ronald, 1983, ISBN O-85398-O13-6
Jan Jasion, Abdu'l-Baha in France, 1911 & 1913, Editions Baha'ies France, Paris, 2016, p.
