Giebels, Lambert
Soekarno: biografi 1901-1950
Grasindo, 2001
 Buku Teks SO
Ward, A.C.
Twentieth-century literature 1901-1950
The English Language Book, 1928
 Buku Teks SO
Hanna, Archibald, 1916-2010
A mirror for the nation : an annotated bibliography of American social fiction, 1901-1950
Garland Publishing, 1985
 Buku Referensi
The Acts of the Parliament of the Commonwealth of Australia, 1901-1950 : to which is prefixed the Commonwealth of Australia Constitution Act (63 and 64 Vict. Ch. 12) as altered to the 31st December 1950, with notes of cases, tables and indexes vol. II-vol. VI
Law Book Co. of Australia, 1952-1955
 Buku Teks