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Georgiev, Vladimir I., editor (1971), “вилица”, in Български етимологичен речник[Bulgarian Etymological Dictionary] (in Bulgarian), volume 1 (А – З), Sofia: Bulgarian Academy of Sciences Pubg. House, →ISBN, page 148
Georgiev, Vladimir I., editor (1971), “вила”, in Български етимологичен речник[Bulgarian Etymological Dictionary] (in Bulgarian), volume 1 (А – З), Sofia: Bulgarian Academy of Sciences Pubg. House, →ISBN, page 147