Lua APA (7ú heag.)

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.

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