Cita APA (7th ed.)
Helm, E., & Stille, W. (1985). AIDS. Acquired Immune Deficiency Syndrome. Zuckschwerdt.
Cita Chicago (17th ed.)
Helm, Eilke, i Wolfgang Stille. AIDS. Acquired Immune Deficiency Syndrome. Bern, Wien: Zuckschwerdt, 1985.
Cita MLA (9th ed.)
Helm, Eilke, i Wolfgang Stille. AIDS. Acquired Immune Deficiency Syndrome. Zuckschwerdt, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.