edited by Rolf Toman; photos by Achim Bednorz
H.F. Ullmann, 2010
Buku Referensi
Radding, Charles M.
Yale University Press, 1991
Buku Teks SO
Clapham, Alfred, Sir
Longman, Green, 1950
Buku Teks SO
edited by Anna Ray-Jones; foreword, Eiji Maki and William A. McDonough
Wiley-Academy, 2000
Buku Teks SO
by Agoes Arismunandar ... [and others]; editor, Gunawan Tjahjono
Archipelago, 1998
Buku Teks SO