Cita APA (7th ed.)

Gray, P. (1989). Guide to IFPS (interactive financial planning system). McGraw-Hill.

Cita Chicago (17th ed.)

Gray, Paul. Guide to IFPS (interactive Financial Planning System). Singapore: McGraw-Hill, 1989.

Cita MLA (9th ed.)

Gray, Paul. Guide to IFPS (interactive Financial Planning System). McGraw-Hill, 1989.