Romero Rangel, S., & Rojas Zenteno, E. C. (1991). Floristic study of the Huehuetoca region, State of Mexico. Instituto de Ecología, A.C.
Citace podle Chicago (17th ed.)Romero Rangel, Silvia, a E. Carlos Rojas Zenteno. Floristic Study of the Huehuetoca Region, State of Mexico. Instituto de Ecología, A.C, 1991.
Citace podle MLA (9th ed.)Romero Rangel, Silvia, a E. Carlos Rojas Zenteno. Floristic Study of the Huehuetoca Region, State of Mexico. Instituto de Ecología, A.C, 1991.