APA (7th ed.) Citation

Nöstlinger, C., Bell, A., & Nicklaus, C. (1983). Konrad. Avon Books.

Chicago Style (17th ed.) Citation

Nöstlinger, Christine, Anthea Bell, and Carol Nicklaus. Konrad. New York: Avon Books, 1983.

MLA (9th ed.) Citation

Nöstlinger, Christine, et al. Konrad. Avon Books, 1983.