| 1 | Agricultural Seed Production, R. George, CABI Publishing, 2011, 216 s. |
| 2 | Handbook of Seed Science and Technology, A.S. Basra, Haworth Press, 2006, 795 s. |
| 3 | Vegetable Seed Production, R. George, CABI Publishing, 2009, 328 s. |
| 4 | Seed Production, Principles and practices, M.F. McDonald, L.O. Copeland, 1997, 749 s. |