(1967). Foreman's handbook. McGraw-Hill.
Chicago Style (17th ed.) ZitazioaForeman's Handbook. New York: McGraw-Hill, 1967.
MLA (9th ed.) ZitazioaForeman's Handbook. McGraw-Hill, 1967.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
(1967). Foreman's handbook. McGraw-Hill.
Chicago Style (17th ed.) ZitazioaForeman's Handbook. New York: McGraw-Hill, 1967.
MLA (9th ed.) ZitazioaForeman's Handbook. McGraw-Hill, 1967.