McGreevy, Paul; Grassia, Tanya D.; Harman, Alison M. (December 2004), "A strong correlation exists between the distribution of retinal ganglion cells and nose length in the dog", Brain, Behavior and Evolution, 63 (#1): 13–22, doi:10.1159/000073756, PMID14673195, S2CID24772865
McGreevy, Paul; Grassia, Tanya D.; Harman, Alison M. (December 2004), "A strong correlation exists between the distribution of retinal ganglion cells and nose length in the dog", Brain, Behavior and Evolution, 63 (#1): 13–22, doi:10.1159/000073756, PMID14673195, S2CID24772865
McGreevy, Paul; Grassia, Tanya D.; Harman, Alison M. (December 2004), "A strong correlation exists between the distribution of retinal ganglion cells and nose length in the dog", Brain, Behavior and Evolution, 63 (#1): 13–22, doi:10.1159/000073756, PMID14673195, S2CID24772865