

Heimildir:
- Lowdermilk, D. L. og Perry, S. E. (2004). Maternity & Women´s Health Care (8. útgáfa). St. Louise:St. Louise: Mosby.
- Zaichkin, J. (2002b). A different beginning. Í J. Zaichkin (Ritstj.), Newborn Intensive Care: What Every Parent Needs to Know (2. útgáfa, bls 15-31). California: NICU INK Book Publishers.
- Madden, S. L. (2000). The Preemie Parents´ Companion: A Essential Guide to Caring for Your Premature Baby in the Hospital, at Home and Though the First Years. Boston: The Harvard Common Press.