Hiendleder, S.; Mainz, K.; Plante, Y.; Lewalski, H. (1998). ”Analysis of mitochondrial DNA indicates that domestic sheep are derived from two different ancestral maternal sources: No evidence for contributions from urial and argali sheep”. Journal of Heredity 89 (2): sid. 113–20. doi:10.1093/jhered/89.2.113. PMID 9542158.
Hiendleder, S.; Mainz, K.; Plante, Y.; Lewalski, H. (1998). ”Analysis of mitochondrial DNA indicates that domestic sheep are derived from two different ancestral maternal sources: No evidence for contributions from urial and argali sheep”. Journal of Heredity 89 (2): sid. 113–20. doi:10.1093/jhered/89.2.113. PMID 9542158.