Tze Fong Go, author
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Artikel Jurnal
Morton E. Winston, Ralph D. Edelbach, editors
Wadsworth and Cengage Learning, 2012
Buku Teks
Calvin Geraldo Sugiarto, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2020
UI - Makalah dan Kertas Kerja
edited by Nigel Cross, David Elliott and Robin Roy
Hutchinson Educational , 1974
Buku Teks
Outhwaite, William, author
Blackwell, 2006
Buku Teks