Tractatus de tonis

MLA

Cruce, Petrus de, and Denis Harbinson. Tractatus De Tonis. American Institute of Musicology, 1976.

APA

Cruce, P. de, & Harbinson, D. (1976). Tractatus de tonis. American Institute of Musicology.

Chicago

Cruce, Petrus de Tractatus De Tonis. Edited by Denis Harbinson. : American Institute of Musicology, 1976.