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REFERENCE |
Hübner's Weltstatistik, 73rd edition, edited by Ernst Rösner, Wien 1939
Shubi L. Ishemo, Forced Labour and Migration in Portuguese African Colonies, pp.162-165
in : Robin Cohen, The Cambridge Survey of World Migration, Cambridge : UP 1995, KMLA Lib.Sign. 304.809 C678c
Article : Portugal : Sao Tome and Principe, in : Statesman's Yearbook 1919 p.1164, 1924 p.1221, 1925 pp.1229, 1926 p.1191, 1928 p.1225,
1929 p.1202, 1932 p.1221, 1937 p.1253 [G]
Article : Sao Thome and Principe, in : Americana Annual 1927 p.781, 1928 p.714, 1930 pp.700-701, 1931 p.697, 1932 p.653, 1933 p.703,
1934 p.541, 1935 p.647, 1936 pp.662-663, 1937 p.636 [G]
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