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1de réir Nayar, Baldev RajAvailable for University of the Philippines System via Oxford Scholarship Online. Click here to access
Foilsithe / Cruthaithe 2012
Electronic Resource -
2de réir Cerny, Philip G. 1946-Available for University of the Philippines System via Oxford Scholarship Online. Click here to access
Foilsithe / Cruthaithe 2010
Electronic Resource -
3de réir Blouet, Brian W. 1936-Available for University of the Philippines System via IG Publishing. Click here to access
Foilsithe / Cruthaithe 2001
Electronic Resource