Abby-Kalio (1982), Altevogt (1959)†, Altevogt (1965)†, Alvarez (1968)†, Baakdah (2018)†, Barea-Azcón et al. (2008)†, Castro (2012)†, Crane (1975)†, Ewa-Oboho (1993), Ewa-Oboho & Abby-Kalio (1994), Gonzáles (2018)†, Gonzáles et al. (2017)†, Günther (1963)†, Manning & Holthuis (1981), Monod (1956), Onadeko et al. (2015), Ovuru & Dambo (2003), Oyenekan (1995), Rodríguez et al. (1997)†, Rodríguez-Tovar et al. (2014)†, Rosenberg (2000)†, Rosenberg (2001)†, Rosenberg (2020), Salawu et al. (2016), Snowden & Ekweozor (1987), Snowden & Ekweozor (1990), Spivak & Cuesta (2009)†, von Hagen (1962)†
Entries marked with † represent indirect references to location through citation.