Davis, P. H. , 1982: Scrophulariaceae in Flora of Turkey vol. 5: 458–748. Edinburgh University.
Elisens N J. 1985, The systematic significance of seed coat anatomy among new world species of tribe Anterrhineae (Scrophulariaceae). Systematic Botany 10: 282 – 299.
Komarov V. L. 1934: Scrophulariaceae in Flora of the U. R. S. S. vol. 22: 202-258- Moskva & Leningerad.
Sutton D. A. 1988: A Revision of the Tribe Anterrhineae. -British Museum (Natural History ) Oxford University press London & Oxford.
)
