United States. Central Intelligence Agency, CIA World Fact Book, 2004 — Malaysia (2004)
“ Federation of Malaysia (Malaya, Sabah, Sarawak, and Singapore) formed 9 July 1963 (Singapore left Federation on 9 August 1965) ; nominally headed by paramount ruler and a bicameral Parliament consisting of a nonelected upper house and an elected lower house; all Peninsular Malaysian states have hereditary rulers except Melaka and Penang; those two states along with Sabah and Sarawak in East Malaysia have governors appointed by Malaysian Government; powers of state governments are limited by federal constitution ”
