1. Appleby, Gordon 1976 The development of a central-place marketing system in the Department of Puno, Peru. Unpublished Ph.D. dissertation, Stanford Univ.
2. Cambios en Puno;Bourricaud,1967
3. La labor cultural educativa del amauta moderna indigena;Chambi;Plateria,1961
4. Central places in southern Germany;Christaller,1966
5. Davies, T. J. 1970 Indian integration in Peru: A half-century of experience, 1900–1948. Unpublished Ph.D. dissertation, Univ. of New Mexico.