Hedung, Tilde, author
Routledge, Taylor & Francis Group, 2010
Buku Teks
Habermas, Jurgen, author
Heinemann, 1974
Buku Teks
Waldman, Don E., author
Pearson, 2007
Buku Teks
Lachman, Leon, author
Lea & Febiger, 1976
Buku Teks
Minshull, Roger
Hutchinson University Library, 1971
Buku Teks