| 1889 | Hippurites (Orbignya) bulgaricus* -- TOULA
, p. 101, pl. 3, fig. 24 a-d |
| 1897 | H. bulgaricus Toula -- DOUVILLÉ
, pp. 188, 222 |
| 1932 | Hippurites (Orbignya) bulgaricus Toula -- KÜHN
, p. 40 |
| 1978 | Hippuritella bulgarica (Toula) -- PAMOUKTCHIEV
, tab.1 |
| 1981 | Hippurites bulgaricus Toula -- S+NCHEZ
, p. 15 |
| 1981 | Hippuritella bulgarica (Toula) -- PAMOUKTCHIEV
, p. 401, text-fig.1 |
| 1981 | Hippuritella bulgarica (Toula) -- PAMOUKTCHIEV
, p. 160, pl.77, figs.5,5a,5b,6,6a |
| 1985 | Hippuritella bulgarica -- CAUS & VICENS
, p. 275 |
| 1986 | Hippuritella bulgarica (Toula) -- PAMOUKTCHIEV
, p. 101, pl.3, figs.1-6 [copy Toula 1889, Pamouktchiev 1981c] |
| 1992 | Hippuritella bulgarica (Toula) -- SWINBURNE et al.
, text-fig.2 |