1. : Orban's Oral Histology and Embryology. St. Louis, C. V. Mosby Co., 6th ed., 1966, pp 12–16.
2. : Craniofacial Embryology. Bristol, J. Wright and Sons, 1973, pp 102–106.
3. : Het Tongcarcinoom. Niemeyer, Amsterdam and Groningen, 1973, pp 4–6.
4. : Embryologie. Stuttgart, G. Thieme Verlag, 1965, pp 439–440.
5. : Human Embryology. New York, McGraw-Hill Book Co., 3rd ed, 1968 .