Kaleem, S., Hassan, F., Bukhsh, M., Mahmood, I., Ullah, R., Ahmad, M., & Wasaya, A. (2011). Oil and Oil Quality in Different Circles of Mature Sunflower Head as Influenced by Varying Environments. Pakistan Journal of Nutrition, 10(4), 373–377. https://doi.org/10.3923/pjn.2011.373.377