Konsep manusia ideal dalam pemikiran Hamka the concept of ideal man in Hamka thoughts Elfi dan Damardjati Supadjar
 Artikel Jurnal
Amery, L.S.
Thoughts on the constitution
Oxford University Press, 1953
 Buku Teks
Park, Won
Thoughts of a Korean
Inka University Press, 1970
 Buku Teks
Pringle, John Martin Douglas, 1912-
On second thoughts
Angus and Robertson, 1971
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Sopa Merim Pemere
Distingsi antara Manusia dan hewan dalam Pemikiran Roger Scruton; Suatu Analisis Moral Terhadap Hewan = Distinction between Man and Animal Based on The Thoughts of Roger Scruton; A Moral Analysis on Animal
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
 UI - Skripsi Membership