Hafiz Firdaus Abdullah. Kaedah memahami hadis-hadis musykil / Hafiz Firdaus Abdullah. - Johor Bahru : Jahabersa, 2003. - xiii, 178 p. ; 23 cm. ISBN: 9831704282 (pbk.) RM Subjects--Topical Terms: Hadith --Methodology.Science in the Hadith.Hadith --Commentaries.