1. Arifin, N.S., and Okubo, H. 1996. Geographical distribution of allozyme patterns in shallot (Allium cepa var. ascalonicum Backer) and wakegi onion (A. x wakegi Araki), Euphytica 91: 305-313.
2. Arifin, N.S., Ozaki, Y., and Okubo, H. 2000. Genetic diversity in indonesian shallot (Allium cepa var. ascalonicum) and Allium x wakegi revealed by RAPD markers and origin of A. x wakegi identified by RFLP analyzes of amplified chloroplast genes, Euphytica 111: 23-31.
3. Astley, D., Innes, N.L., and Van der Meer, Q.P. 1982. Genetic Resources of Allium Species, IBPGR secretariat, Rome, Italy, pp. 38.
4. Astley, D. 1990. Conservation of genetic resources, in: Onions and Allied Crops Vol I, H.D. Rabinowitch, and J.L. Brewster, eds., CRC Press Inc, Boca Raton, Florida, USA., pp. 177-198.
5. Bailey, L.H. 1949. Manual of cultivated plants, The MacMillan Co., New York. pp. 1116.