Coba jelasin Putera ڤوترا dari Sultan Ibrahim Ismail ibni Almarhum Sultan Iskandar dalam bahasa melayu dong

Ali, Abdullah, Malaysian Protocol and Correct Forms of Address, published by Times Books International, 1986, ISBN 9971653702

Cheong, Mei Sui, Information Malaysia: 1985 Year Book,published by Berita Publishing, 1985

De Ledesma, Charles; Lewis, Mark; Savage, Pauline, Malaysia, Singapore and Brunei, published by Rough Guides, 2003, ISBN 1843530945

Karim, Gulrose; Tate, Desmond Muzaffar, Information Malaysia, published by Berita Publ. Sdn. Bhd., 1989

Kershaw, Roger, Monarchy in South-East Asia: The Faces of Tradition in Transition, published by Routledge, 2001, ISBN 0415185319

Morais, John Victor, The Who's who in Malaysia, published by Solai Press., 1967

Morris, Ira J., My East was Gorgeous, by Ira J. Morris, published by Travel Book Club, 1958

Nadarajah, K. N, Tengku Ahmad Rithauddeen: His Story, Pelanduk Publications, 2000, ISBN 9679787095

Nadarajah, Nesalamar, Johore and the Origins of British Control, 1895-1914, published by Arenabuku, 2000, ISBN 9679703185

Rahman, Abdul; Solomon, J. S., Challenging Times, published by Pelanduk Publications, 1985, ISBN 9679780945

The International Who's Who 2004: Book with Single-User Online Access, by Elizabeth Sleeman, published by Europa Publications, Published by Routledge, 2003, ISBN 1857432177

Towards Relevant Education: A General Sourcebook for Teachers, published by Education Forum (Philippines), Alternative Instructional Materials Project, Education Forum, 1986, ISBN 9719100605