Mind : a quarterly review of philosophy
Oxford: Oxford University Press
 Majalah, Jurnal, Buletin
Tijdschrift voor philosophie
Utrech : N.V Vereneging
 Majalah, Jurnal, Buletin
Blackburn, Simon
The Oxford dictionary philosophy
 Buku Referensi
Dialectica : international review of philosophy of knowledge
Paris : Presses Universitares de France
 Majalah, Jurnal, Buletin
Contemporary political philosophy: an anthology
edited by Robert E. Goodin and Philip Pettit
Oxford Blackwell Publishers 1997,
 Buku Teks