Wallner C, Maas C, Dabhoiwala N, Lamers W, Deruiter M (2006). "Evidence for the innervation of the puborectalis muscle by the levator ani nerve". Neurogastroenterol Motil. 18 (12): 1121–2. PMID 17109696.{{cite journal}}: CS1 maint: multiple names: authors list (ลิงก์)