Cita APA (7th ed.)
(1991). Aids prevention in Switzerland. s.n.].
Cita Chicago (17th ed.)
Aids Prevention in Switzerland. [S.l: s.n.], 1991.
Cita MLA (9th ed.)
Aids Prevention in Switzerland. s.n.], 1991.
Atenció: Aquestes cites poden no estar 100% correctes.