Six duets for two violins :
easy pieces without keyboard /
by Blavet, Geminiani, Jomelli, Oswald, Sammartini and Rameau ; edited by Adolfo Betti.

APA Citation

Betti, A. (1947). Six duets for two violins: easy pieces without keyboard. New York: Music Press.

MLA Citation

Betti, Adolfo. Six Duets for Two Violins: Easy Pieces Without Keyboard. New York: Music Press, 1947.

Warning: These citations may not always be complete (especially for serials).