Romero Rangel, S., & Rojas Zenteno, E. C. (1991). Floristic study of the Huehuetoca region, State of Mexico. Instituto de Ecología, A.C.
Čikaški stil citiranja (17. izdanje)Romero Rangel, Silvia, i E. Carlos Rojas Zenteno. Floristic Study of the Huehuetoca Region, State of Mexico. Instituto de Ecología, A.C, 1991.
MLA način citiranja (9. izdanje)Romero Rangel, Silvia, i E. Carlos Rojas Zenteno. Floristic Study of the Huehuetoca Region, State of Mexico. Instituto de Ecología, A.C, 1991.
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