United Nations. Economic Commission for Asia and the Far East. Committee for Co-ordination of Joint Prospecting for Mineral Resources in Asian Offshore Areas. (1990). Technical bulletin vol.21. s.n.
Cita Chicago (17th ed.)United Nations. Economic Commission for Asia and the Far East. Committee for Co-ordination of Joint Prospecting for Mineral Resources in Asian Offshore Areas. Technical Bulletin Vol.21. [Tokyo]: s.n, 1990.
Cita MLA (9th ed.)United Nations. Economic Commission for Asia and the Far East. Committee for Co-ordination of Joint Prospecting for Mineral Resources in Asian Offshore Areas. Technical Bulletin Vol.21. s.n, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.