1. Gasser RF. Atlas of human embryos. 1st ed. Hagerstown: Harper and Row; 1975.
2. Gasser RF, Cork RJ, Stillwell BJ, McWilliams DT. Rebirth of human embryology. Dev Dyn. 2014;243:621–8.
3. Endo A, Ueno S, Yamada S, Uwabe C, Takakuwa T. Morphogenesis of the spleen during the human embryonic period. Anat Rec. 2015;298:820–6.
4. Drake RL, Vogl AW, Mitchell AWM. Gray’s anatomy for students. 3rd ed. Philadelphia, PA: Churchill Livingstone; 2015.
5. Moore KL, Dalley AF, Agur AMR. Clinically oriented anatomy. 7th ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2014.