PRATOMO, G. S. Pengaruh Jenis Media dengan Hormon Tumbuh NAA-BAP terhadap Pertumbuhan dan Kandungan Flavonoid Kalus Daun Echinaceae purpurea (L.) Moench: Effect of Media Types with NAA-BAP Growth Hormones on the Growth and Content of Flavonoids of Echinaceae purpurea (L.) Moench Leaf Callus. Jurnal Surya Medika (JSM), v. 1, n. 2, p. 51–57, 1 Feb.2016.