Limantara, V., S. S., I. Mudita, W. Retayasa, and M. Kardana. “Effect of Oral Vitamin K Prophylaxis on Prothrombine Time and Activated Partial Thromboplastin Time: A Randomized Controlled Comparison With an Intramuscular Vitamin K in Infants”. Paediatrica Indonesiana, Vol. 47, no. 3, July 2007, pp. 109-14, doi:10.14238/pi47.3.2007.109-14.