Iftitah, S. N., N. B. A. . Rahmawati, R. P. . Utami, and V. Vatjarjinanto. “The Effect of Different Types Manure and Altitude on Wheat Production”. Gontor Agrotech Science Journal, vol. 9, no. 2, Oct. 2023, pp. 102-8, doi:10.21111/agrotech.v9i1.9555.