Bradley, PR. (2006). Used Plant; a Handbook of Scientific Information on Widely Drugs, Volume 2. - Bournemouth (UK): British Herbal Medicine Association.
Boissier, E. (1875): Calendula in Flora Orientalis 3: 416-419. -Basileae & Genevae.- Hoffmann, D. (2003). Medical Herbalism. Rochester (VT): Healing Arts Press.
Jafari, E and Joharchi, M. (2009). Calendula karakalensis (Asteraceae), a new record for the flora of Iran. Iranian journal of botany. 15 (2): 183- 185.
Khare, CP. (2004). Encyclopedia of Indian Medicinal Plants. Germany, Springer-Verlag Publisher,, pp 116-117.
Lt. Colonel Kirtikar, KR and Major Basu, BD. (1993). Indian Medicinal Plants. Vol II, Deharadun, India, International Book Distributor. pp1413- 1414.
Meikle, R. D. (1975): Calendula in Davis P. H. Flora of Turkey vol. 5: 170-172. - dinburgh.
Parsa, A. (1949): Calendula in Flora de I' Iran 3: 320- 322. - Tehran.
Rechinger, K. H. (1989): Compositae VII: Calendula in Rechinger, K.H. (ed.) Flora Iranica no. 164: 99-105. ñGraz: Akademische Druck- und Verlagsanstalt.
Vasilchenko I. T. (1961): Calendula in Schishkin B. K. & Bobrov, E. G. Flora of URSS 26: 857 ñ 861.- Moskva & Leningrad.
Tutin, T. G & et al. (1976): Flora Europaea; 4: 206-207. - Cambridge.