Quotes:Sepher Yetzirah
H. P. Blavatsky
Sepher Yetzirah. "The Book of Formation". A very ancient Kabbalistic work ascribed to the patriarch Abraham. It illustrates the creation of the universe by analogy with the twenty-two letters of the Hebrew alphabet, distributed into a triad, a heptad, and a dodecad, corresponding with the three mother letters, A, M, S, the seven planets, and the twelve signs of the Zodiac. It is written in the Neo-Hebraic of the Mishnah.
Source: H. P. Blavatsky, The Theosophical Glossary, art. Sepher Yetzirah
Zirkoff, Boris
*Sepher Yetzirah. See Vol. VIII, p. 415, for particulars.
Source: Boris de Zirkoff, «H. P. Blavatsky Collected Writings», vol. 1, p. 523
*Sepher Yetzirah or Book of Formation. Reputed to be the oldest Kabbalistic work, attributed to Rabbi Akiba. It deals with permutations of numbers and letters, and is our first sources for the doctrine of emanations and the Sephiroth. The editio princeps is that of Mantua, 1562, with several subsequent ones. Text and Comm, by Dunash ben Tamim have been publ. by M. Grossberg, London, 1902, and parts of it have been transl. by W. Wynn Westcott (Bath: R. H. Fryar, 1887, 4to; 2nd ed., London: Theos. Publ. Society, 1893). See also Knut Stenring, The Book of Formation, a translation publ. in 1923, 8vo.
Source: Boris de Zirkoff, «H. P. Blavatsky Collected Writings», vol. 3, p. 530