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2. Basilevskaya, N. A., 1928: On the races of the Opium poppy, growing in Semiretchic, and the Origin of their culture. Bull. appl. Botany, Genetics and Pl. Breeding XIX, 2: 95 (russ.).
3. 1931: Principal botanical-systematical groups of the Opium poppy, Papaver somniferum. Bull. appl. Botany, Genetics and Pl. Breeding XXV, 5: 185 (russ.).
4. Bauhin, C., 1623: Pinax Theatri Botanici, 170. Basel.
5. Besler, B., 1640: Hortus Eystettensis, ed. 2 : 12.