Singapore. Ministry of Finance. (1961). Development, 1961-64. s.n.
Cita Chicago (17th ed.)Singapore. Ministry of Finance. Development, 1961-64. s.l: s.n, 1961.
Cita MLA (9th ed.)Singapore. Ministry of Finance. Development, 1961-64. s.n, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.