Kavchak-Keyes MA, Long M.
Nursing. 1977 Aug;7(8):70-2. doi: 10.1097/00152193-197708000-00022.
PMID: 586519

Gardener MG.
Nurs Mirror Midwives J. 1976 Jul 29;143(5):45-6.
PMID: 1048534

Iveson-Iveson J.
Nurs Mirror. 1981 Dec 09;153(24):54.
PMID: 6916292

Finn E.
Nurs Mirror. 1982 Feb 17;154(7):42.
PMID: 6917304

[No authors listed]
Nurs Mirror Midwives J. 1972 Dec 01;135(22):16-8 concl.
PMID: 4486313

Winter EJ, Pugh LC, Riley-Giomariso O.
Nursing. 1992 Jan;22(1):88, 90, 92-3.
PMID: 1741097

Wehrlin N.
Rev Infirm. 1978 Dec;28(10):839-44.
PMID: 254286