found: The son of mad Mat Lela, 1983:t.p. (Ishak Haji Muhammad)
found: LC data base, 12/18/84(hdg.: Ishak bin Haji Mohammad; usage: Ishak Haji Muhammad)
found: Pak Sako bistari, 1988:t.p. (Pak Sako) p. 1 (Dr. Haji Ishak Haji Muhammad; b. 9/24/09)
found: Pak Pandir Moden. Di simpang-simpang jalan, 1988:t.p. (Pak Pandir Moden) cover, p. 4 (real name: Ishak Haji Muhammad)
found: The prince of Mount Tahan, 2019:title page (Ishak Haji Muhammad) cover page 4 (Ishak Haji Muhammad, 1909-1991; was one of Malaysia's pioneer nationalists; also was a prolific writer of articles, novels, and poems)
found: Wikipedia, viewed May 11, 2023(Ishak Haji Muhammad; born November 14, 1909 in Kampung Bukit Seguntang, Temerloh, Pahang; died November 7, 1991 in Kampung Bukit Raya, in Hulu Langat, Selangor; also known as Pak Sako, was a Malaysian writer, active in the 1930s until the 1950s. He was a nationalist and his involvement began before independence and continued thereafter)
