Cita APA (7a ed.)

Lewis, R., & Herdeg, W. (1971). Annual reports. Graphi.

Cita Chicago Style (17a ed.)

Lewis, Richard, y Walter Herdeg. Annual Reports. Zurich: Graphi, 1971.

Cita MLA (9a ed.)

Lewis, Richard, y Walter Herdeg. Annual Reports. Graphi, 1971.