van Aswegen EJ, Basson AA.
Curationis. 1994 Feb;17(1):32-7.
PMID: 8044870

Dagsland H.
Int Nurs Rev. 1978 Jul-Aug;25(4):116-8.
PMID: 248365

Hall DC.
Krankenpflege (Frankf). 1977 Feb;31(2):40-2.
PMID: 190459

Davidsen MM.
Sygeplejersken. 1989 Apr 19;89(16):12-5.
PMID: 2749566

Darcy PT.
Nurs Mirror Midwives J. 1975 Aug 07;141(6):69.
PMID: 1041362

Howard V.
Nurs Stand. 1994 Feb 16-22;8(21):36-7. doi: 10.7748/ns.8.21.36.s49.
PMID: 8155539

Ham-Ying S.
Nurs Times. 1996 Apr 17-23;92(16):28-30.
PMID: 8710589

Dadgaran I, Shirazi M, Mohammadi A, Ravari A.
J Adv Med Educ Prof. 2016 Jul;4(3):122-9.
PMID: 27382579