Hamka, author
Pustaka Islam, 1983
Buku Referensi
Hamka (Hadji Abdul Malik Karim Amrullah), 1908-1981, author
Pustaka Islam, 1983
Buku Referensi
Al-Rumi, Yaqut, author
Matbu`at Dar al-Ma`mun, [Date of publication not identified]
Buku Teks
Oxford University Press, 1954
Buku Teks
Artikel Jurnal