Wendel, Jonathan F. and A. Edward Percival. Percival, A. E. and R. J. Kohel. Distribution, collection and evaluation of Gossypium . Percival, A. E. 1991.
Collectors track cotton in Latin America to stay ahead of habitat destruction.
66-68 Percival, A. E. 1991. Stewart, James McD., A. E. Percival, L. Perez S., and E. A. Garcia C. 1991. Collection of wild Gossypium spp. Percival, A. Edward, James McD. Stewart, Lorenzo Perez, Alejandro Garcia, and Arturo Hernandez. Collecting cotton endemic to northwest Mexico.