Gray, P. (1989). Guide to IFPS (interactive financial planning system). McGraw-Hill.
Chicago Style (17. basım) AtıfGray, Paul. Guide to IFPS (interactive Financial Planning System). Singapore: McGraw-Hill, 1989.
MLA (9th ed.) AtıfGray, Paul. Guide to IFPS (interactive Financial Planning System). McGraw-Hill, 1989.
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