Y. Heniwati, N. Jamarun, R. Sriagtula, and Z. Ikhlas, “Pengaruh Interval Defoliasi terhadap Kualitas Indigofera zollingeriana di BPTU HPT Padang Mengatas Provinsi Sumatera Barat: Effect of Defoliation Interval onProductivity and Quality of Indigofera zollingeriana at BPTU HPT Padang Mengatas West Sumatra Province”, JPI, vol. 28, no. 1, pp. 1–10, Feb. 2026.