Gray, P. (1987). Guide to IFPS (Interactive Financial Planning System) (2nd ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Gray, Paul. Guide to IFPS (Interactive Financial Planning System). 2nd ed. New York: McGraw-Hill, 1987.
Lua MLA (9ú heag.)Gray, Paul. Guide to IFPS (Interactive Financial Planning System). 2nd ed. McGraw-Hill, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.