Ranjit Singh s/o Darshan Singh. Malaysia-Brunei relations in the 1960s and 1970s. 1977.
Ranjit Singh, D. S. Brunei and the hinterland of Sabah: commercial and economic relations with special reference to the second half of the nineteenth century. Singapore: National University of Singapore, 1990.
Ranjit Singh. Brunei: the problems of political survival 1839-1963. 1976.
Ranjit Singh. Government-labour relations in West Malaysia: (with particular reference to the period 1959 to 1969). 1970.
Ranjit Singh. The native chiefs' advisory council of Sabah, 1915-1941. [Kuala Lumpur]: Jabatan Sejarah, Universiti Malaya, 1980.
Ranjit Singh, D. S. Brunei, 1839-1983: the problems of political survival. Singapore: Oxford University Press, 1984.
Ranjit Singh, D. S. The development of indigenous society and administration in Sabah: 1865-1941. 1986.