W. Bartold, Turkestan Down to the Mongolian Invasion (London, 1928).
Bemeker
E. Berncker, Slavisches Etymologisches Worterbuch (Heidelberg. Vol. 1, 1908-13; Vol. II, Fasc. 1, s.a.).
Beshevliev
V. Beshevliev, «Prvobolgarski nadpisi.» See Sources, I, 1.
BGA
Bibliotheca Gcographonim Arabicorum, ed. M. J. Goje (Leyden).
BNJ
Byzantisch-NeugriechischeJahrbucher.
Book of Annals