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List, Rurik; Ceballos, Gerardo; Pacheco, Jesús (September 1999). "Status of the North American Porcupine (Erethizon dorsatum) in Mexico". The Southwestern Naturalist. 44 (3). Southwestern Naturalist Society: 400–404. JSTOR30055242.
Mabille, Géraldine; Descamps, Sébastien; Berteaux, Dominique (March 11, 2010). "Predation as a probable mechanism relating winter weather to population dynamics in a North American porcupine population". Population Ecology. 52 (4): 537–546. doi:10.1007/s10144-010-0198-5. S2CID27888886.