APA

(1997). Secret hydrographic surveys in the Spratly islands. Kuala Lumpur: Maritime Institute of Malaysia.

Chicago

1997. Secret hydrographic surveys in the Spratly islands. Kuala Lumpur: Maritime Institute of Malaysia.

Harvard

(1997). Secret hydrographic surveys in the Spratly islands. Kuala Lumpur: Maritime Institute of Malaysia.

MLA

Secret hydrographic surveys in the Spratly islands. Kuala Lumpur: Maritime Institute of Malaysia. 1997.