Effectiveness of Methanol Solvent Extraction for Red Macroalgae Acanthophora spicifera Antitumoric Activity, Prasedya, Eka Sunarwidhi, Martyasari Ni Wayan Riya, Hamdin Candra Dwipayana, Miyake Masao, Kobayashi Daisuke, Widyastuti Sri, Hazama Akihiro, and Sunarpi Haji , Pharmacognosy Journal, May 2019, Volume 11, Issue 3, p.450-454, (2019)