Suzuki K.
Kango Tenbo. 1989 Feb;14(3):302.
PMID: 2739448

Levar R, Molland A.
Nurs Mirror. 1985 Jun 19;160(25):56-8.
PMID: 3847975

Andreasen U, Sievert A.
Sygeplejersken. 1992 May 20;92(21):22-3.
PMID: 1455341

Torres G.
NLN Publ. 1974;9-14.
PMID: 4499367

Sheahan J.
Nurs Mirror Midwives J. 1977 Apr 14;144(15):58-60.
PMID: 585078

Coker LS.
Nurse Educ. 1990 Nov-Dec;15(6):14, 19. doi: 10.1097/00006223-199011000-00004.
PMID: 2250804

Thompson T.
Nurs Stand. 1990 May 30-Jun 5;4(36):46. doi: 10.7748/ns.4.36.46.s47.
PMID: 2112720