Loon, Hendrick Van
Garden City Publishing Co.,Inc., 1926
Buku Teks
Retno Tri Wardhani, author
Universitas Indonesia, 1990
UI - Skripsi (Membership)
Chulaifah
Artikel Jurnal
Loon, Hendrik Willem van, author
New York [t.p.] 1958
Buku Teks
Howells, William D., author
Doubleday, 1967
Buku Teks