Almazán-Núñez, R. C. (2009). Additional information on the birds from Sierra Norte, Guerrero, Mexico. Instituto de Ecología, A.C.
Čikaški stil citiranja (17. izdanje)Almazán-Núñez, R. Carlos. Additional Information on the Birds from Sierra Norte, Guerrero, Mexico. Instituto de Ecología, A.C, 2009.
MLA način citiranja (9. izdanje)Almazán-Núñez, R. Carlos. Additional Information on the Birds from Sierra Norte, Guerrero, Mexico. Instituto de Ecología, A.C, 2009.
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