Sumirat, U., F. Yuliasmara, and P. . “Analysis of Cutting Growth Characteristics in Robusta Coffee(Coffea Canephora Pierre.)”. Pelita Perkebunan (a Coffee and Cocoa Research Journal), Vol. 29, no. 3, Dec. 2013, doi:10.22302/iccri.jur.pelitaperkebunan.v29i3.9.