Paine, Ingrid S.; Lewis, Michael T. (2017). "The Terminal End Bud: the Little Engine that Could". Journal of Mammary Gland Biology and Neoplasia. 22 (2): 93–108. doi:10.1007/s10911-017-9372-0. ISSN 1083-3021. PMC 5488158. PMID 28168376. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5488158
Paine, Ingrid S.; Lewis, Michael T. (2017). "The Terminal End Bud: the Little Engine that Could". Journal of Mammary Gland Biology and Neoplasia. 22 (2): 93–108. doi:10.1007/s10911-017-9372-0. ISSN 1083-3021. PMC 5488158. PMID 28168376. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5488158