Greville, R.K. (1859). Descriptions of some new species and varieties of Naviculae, etc. observed in Californian guano. Edinburgh New Philosophical Journal, New Series, 10: 25-30, pl. IV page(s): p. 28; pl. 4, fig. 4 [details]
Kociolek, J.P.; Blanco, S.; Coste, M.; Ector, L.; Liu, Y.; Karthick, B.; Kulikovskiy, M.; Lundholm, N.; Ludwig, T.; Potapova, M.; Rimet, F.; Sabbe, K.; Sala, S.; Sar, E.; Taylor, J.; Van de Vijver, B.; Wetzel, C.E.; Williams, D.M.; Witkowski, A.; Witkowski, J. (2025). DiatomBase. Navicula approximata f. approximata Greville, 1859. Accessed at: https://www.diatombase.org/aphia.php?p=taxdetails&id=983623 on 2026-08-10
original descriptionGreville, R.K. (1859). Descriptions of some new species and varieties of Naviculae, etc. observed in Californian guano. Edinburgh New Philosophical Journal, New Series, 10: 25-30, pl. IV page(s): p. 28; pl. 4, fig. 4 [details]