Oldershaw, C. (2008). Philip's gems of the world. Philip's.
Cita Chicago (17th ed.)Oldershaw, Cally. Philip's Gems of the World. London: Philip's, 2008.
Cita MLA (9th ed.)Oldershaw, Cally. Philip's Gems of the World. Philip's, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.