The pectineus is sometimes included in this group,[1][3] and sometimes excluded.[2][4] (It has the same function as the others in this group, but different innervation.)
↑ 1.01.1Ellis, Harold; Susan Standring; Gray, Henry David (2005). Gray's anatomy: the anatomical basis of clinical practice. St. Louis, Mo: Elsevier Churchill Livingstone. ISBN0-443-07168-3.CS1 maint: Multiple names: authors list (link)
↑ 2.02.1Sauerland, Eberhardt K.; Patrick W., PhD. Tank; Tank, Patrick W. (2005). Grant's dissector. Hagerstwon, MD: Lippincott Williams & Wilkins. p. 129. ISBN0-7817-5484-4.CS1 maint: Multiple names: authors list (link)
↑ 3.03.1Kyung Won, PhD. Chung (2005). Gross Anatomy (Board Review). Hagerstwon, MD: Lippincott Williams & Wilkins. p. 123. ISBN0-7817-5309-0.