1. Padget DH. The development of cranial arteries in the human embryo. Contrib Embryol Carneg Instn. 1948;212:205–62.
2. Padget DH. The cranial venous system in man in reference to development, adult configuration, and relation to the arteries. Am J Anat. 1956;98(3):307–55. https://doi.org/10.1002/aja.1000980302.
3. Streeter GL. Developmental horizons in human embryos. Description of age group XIII, embryos about 4 or 5 millimeters long, and age group XIV, period of indentation of the lens vesicle. Contrib Embryol Carnegie Inst Wash. 1945;557(31):27–63.
4. Streeter GL. Developmental horizons in human embryos. Description of age groups XV, XVI, XVII, and XVIII, being the third issue of a survey of the Carnegie collection. Contrib Embryol Carnegie Inst Wash. 1948;575(32):133–203.
5. Streeter GL. Developmental horizons in human embryos. Description of age groups XIX, XX, XXI, XXII, and XXIII, being the fifth issue of a survey of the Carnegie collection (prepared for publication by Heuser CH. And corner GW.). Contrib Embryol Carnegie Inst Wash. 1951;592(34):165–96.