Cita APA (7a ed.)

Idea e.V. & Idea e.V. (1993). Idea-Dokumentation. Idea.

Cita Chicago Style (17a ed.)

Idea e.V. y Idea e.V. Idea-Dokumentation. Wetzlar: Idea, 1993.

Cita MLA (8a ed.)

Idea e.V. y Idea e.V. Idea-Dokumentation. Idea, 1993.