Losada H, Pealing R, Soriano R, Rivera J, Cortés J, Vieyra J and Martínez H 1997:
The rapid appraisal of the geographical influence of the market of Xochimilco in the south-east of Mexico City.
Livestock Research for Rural Development. Volume 9, Article #27.
Retrieved
, from http://www.lrrd.org/lrrd9/3/mex931.htm