APA-viite (7. p.)
Black Book - AT&T (American Telephone & Telegraph Company): 1980. Bernstein Institutional Services LLC.
Chicago-viite (17. p.)
Black Book - AT&T (American Telephone & Telegraph Company): 1980. Bernstein Institutional Services LLC.
MLA-viite (9. p.)
Black Book - AT&T (American Telephone & Telegraph Company): 1980. Bernstein Institutional Services LLC.
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