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Weiss, N., Schillinger, U., Kandler, O. (1983). “Lactobacillus lactis, Lactobacillus leichmannii and Lactobacillus bulgaricus, Subjective Synonyms of Lactobacillus delbrueckii, and Description of Lactobacillus delbrueckii subsp. lactis comb. nov. and Lactobacillus delbrueckii subsp. bulgaricus comb. nov.”. Syst. Appl. Microbiol.4 (4): 552-7. doi:10.1016/S0723-2020(83)80012-5. PMID23194812.
Simova, E. D.; Beshkova, D. M.; Angelov, M. P.; Dimitrov, Z. P. (2008). “Bacteriocin production by strain Lactobacillus delbrueckii ssp. Bulgaricus BB18 during continuous prefermentation of yogurt starter culture and subsequent batch coagulation of milk”. Journal of Industrial Microbiology & Biotechnology35 (6): 559–567. doi:10.1007/s10295-008-0317-x. PMID18273656.