Butyinski, Thomas; Koster, Stanley (1994). "Distribution and conservation status of primates in Bioko island, Equatorial Guinea". Biodiversity and Conservation. 3 (9): 893–909. Bibcode:1994BiCon...3..893B. doi:10.1007/BF00129665. S2CID9467185.
Butynski, Thomas M.; Jong, Yvonne A. de; Hearn, Gail W. (2009). "Body Measurements for the Monkeys of Bioko Island, Equatorial Guinea". Primate Conservation. 24 (1): 99–105. doi:10.1896/052.024.0108. ISSN0898-6207. S2CID86484346.
Owens, Jacob R.; Honarvar, Shaya; Nessel, Mark; Hearn, Gail W. (2015). "From frugivore to folivore: Altitudinal variations in the diet and feeding ecology of the Bioko Island drill ( Mandrillus leucophaeus poensis ): Variations in the Diet of the Bioko Island Drill". American Journal of Primatology. 77 (12): 1263–1275. doi:10.1002/ajp.22479. PMID26375479. S2CID40650260.
Astaras, Christos; Waltert, M. (2010). "What does seed handling by the drill tell us about the ecological services of terrestrial cercopithecines in African forests?: Terrestrial forest primates' role in forest dynamics". Animal Conservation. 13 (6): 568–578. doi:10.1111/j.1469-1795.2010.00378.x. S2CID82430448.
Butyinski, Thomas; Koster, Stanley (1994). "Distribution and conservation status of primates in Bioko island, Equatorial Guinea". Biodiversity and Conservation. 3 (9): 893–909. Bibcode:1994BiCon...3..893B. doi:10.1007/BF00129665. S2CID9467185.
Owens, Jacob R.; Honarvar, Shaya; Nessel, Mark; Hearn, Gail W. (2015). "From frugivore to folivore: Altitudinal variations in the diet and feeding ecology of the Bioko Island drill ( Mandrillus leucophaeus poensis ): Variations in the Diet of the Bioko Island Drill". American Journal of Primatology. 77 (12): 1263–1275. doi:10.1002/ajp.22479. PMID26375479. S2CID40650260.
Butyinski, Thomas; Koster, Stanley (1994). "Distribution and conservation status of primates in Bioko island, Equatorial Guinea". Biodiversity and Conservation. 3 (9): 893–909. Bibcode:1994BiCon...3..893B. doi:10.1007/BF00129665. S2CID9467185.
Butynski, Thomas M.; Jong, Yvonne A. de; Hearn, Gail W. (2009). "Body Measurements for the Monkeys of Bioko Island, Equatorial Guinea". Primate Conservation. 24 (1): 99–105. doi:10.1896/052.024.0108. ISSN0898-6207. S2CID86484346.
Owens, Jacob R.; Honarvar, Shaya; Nessel, Mark; Hearn, Gail W. (2015). "From frugivore to folivore: Altitudinal variations in the diet and feeding ecology of the Bioko Island drill ( Mandrillus leucophaeus poensis ): Variations in the Diet of the Bioko Island Drill". American Journal of Primatology. 77 (12): 1263–1275. doi:10.1002/ajp.22479. PMID26375479. S2CID40650260.
Astaras, Christos; Waltert, M. (2010). "What does seed handling by the drill tell us about the ecological services of terrestrial cercopithecines in African forests?: Terrestrial forest primates' role in forest dynamics". Animal Conservation. 13 (6): 568–578. doi:10.1111/j.1469-1795.2010.00378.x. S2CID82430448.
Butynski, Thomas M.; Jong, Yvonne A. de; Hearn, Gail W. (2009). "Body Measurements for the Monkeys of Bioko Island, Equatorial Guinea". Primate Conservation. 24 (1): 99–105. doi:10.1896/052.024.0108. ISSN0898-6207. S2CID86484346.