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1অনুযায়ী Thompson, William R.Available for University of the Philippines Diliman via Gale Virtual Reference Library. Click here to access
প্রকাশিত 2012
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5অনুযায়ী Hilbink, LisaAvailable for University of the Philippines Diliman via Cambridge. Click here to access
প্রকাশিত 2007
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8অনুযায়ী Caenegem, R. C.Available for University of the Philippines Diliman via Cambridge. Click here to access
প্রকাশিত 1987
Electronic Resource