Febriyenti, Noratiqah Mohtar, Nornisah Mohamed, Mohammad Razak Hamdan, Shahrizan Najib Md Salleh, and Saringat bin Bai @ Baie, “Comparison of Freeze Drying and Spray Drying Methods of Haruan Extract”, ijdd, vol. 6, no. 3, pp. 286–291, Sep. 2014.