Y. A. Reubun, S. Kumala, S. Setyahadi, and P. Simanjuntak, “Pengeringan Beku Ekstrak Herba Pegagan (Centella asiatica): Freeze Drying Method of Pegagan (Centella asiatica) Extract”, Sainstech Farma, vol. 13, no. 2, pp. 113–117, Sep. 2020.