Adriani S.A. Siahaan, Erwin M. Harahap, Chairani Hanum, Abubakar Karim, Halus Satriawan and Ernawita (2022) “The Correlation of Elevation, Soil Chemical Properties and Yield of Coffea arabica L. in Shaded Conditions: Yield of Coffea arabica L. in Shaded Conditions”, Biological Sciences - PJSIR, 65(3), pp. 282–291. Available at: http://v2.pjsir.org/index.php/biological-sciences/article/view/2987 (Accessed: 19 April 2024).