Vasmer, Max (1964–1973) “деть”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
Vasmer, Max (1964–1973) “-детый”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
Trubachyov, Oleg, editor (1977), “*dě(ja)ti”, in Этимологический словарь славянских языков [Etymological dictionary of Slavic languages] (in Russian), numbers 4 (*čaběniti – *děľa), Moscow: Nauka, page 229
Trubachyov, Oleg, editor (1978), “*děnь/*děnьje”, in Этимологический словарь славянских языков [Etymological dictionary of Slavic languages] (in Russian), numbers 5 (*dělo – *dьržьlь), Moscow: Nauka, page 12
Georgiev, Vladimir I., editor (1971), “дея”, in Български етимологичен речник [Bulgarian Etymological Dictionary] (in Bulgarian), volume 1 (А – З), Sofia: Bulgarian Academy of Sciences Pubg. House, →ISBN, page 351
Anikin, A. E. (2019) “деть”, in Русский этимологический словарь [Russian Etymological Dictionary] (in Russian), issue 13 (два – дигло), Moscow: Russian Language Institute, →ISBN, page 302
Anikin, A. E. (2019) “-дет”, in Русский этимологический словарь [Russian Etymological Dictionary] (in Russian), issue 13 (два – дигло), Moscow: Russian Language Institute, →ISBN, page 286
Anikin, A. E. (2019) “деница”, in Русский этимологический словарь [Russian Etymological Dictionary] (in Russian), issue 13 (два – дигло), Moscow: Russian Language Institute, →ISBN, page 200
* The second form occurs in languages that contract early across /j/ (e.g. Czech), while the first form occurs in languages that do not (e.g. Russian).