1. Flore et Végétation du Sahara, Edition Paris;Ozenda,1993
2. Ecological studies of Cistanche tubulosa Wight;Agrawal,1984
3. Flora Arabia III;Blatter;Rec. Bot. Surv. India,1921
4. Some parasitic angiosperms of Sudan, Hydronaceae, Orobanchaceae and Cuscuta (Convolvulaceae);Musselman;Notes RBG Edinb.,1984
5. Dictionary of Chinese Materia Medica;Jiangsu New Medical College,1977