Benirschke K: Obstetrically important lesions of the umbilical cord. J Reprod Med 39:262-272, 1994.
Benirschke K, Kaufmann P: Pathology of the Human Placenta, 5th Edition. New York: Springer Science + Business Media, Inc., 2006.
Naeye RL: Functionally important disorders of the placenta, umbilical cord, and fetal membranes. Hum Pathol 18:680-691, 1987.
Naeye RL: Umbilical cord length: Clinical significance. J Pediat 107:278-281, 1985.
Pinar H, Koch MA, Hawkins H, Heim-Hall J, Shehata B, Thorsten VR, Carpenter M, Lowichik A, Reddy UM: The Stillbirth Collaborative Research Network (SCRN) placental and umbilical cord examination protocol. Am J Perinatol28(10):781-92, 2011.
Thompson JMD, Irgens L, Skjaerven R, Rasmussen S: Placenta weight percentile curves for singleton deliveries. BJOG 114(6):715-720, 2007.
