1. Alexander, J. Colloidal chemistry, principles and applications. 1937.
2. Anderson, K. Essentials of physiological chemistry. 1939.
3. Andrews, E. F. Practical course in botany. 1903.
4. Atkinson, G. F. College textbook of botany. 1905.
5. Babor, J. A. and Lehrman, A. Introductory college chemistry. 1941.