Lings, M., & Neumann, W. (1990). Was ist Sufitum? Aurum-Verlag.
Chicago Style (17th ed.) CitationLings, Martin, and Wolfgang Neumann. Was Ist Sufitum? Freiburg im Breisgau: Aurum-Verlag, 1990.
MLA (9th ed.) CitationLings, Martin, and Wolfgang Neumann. Was Ist Sufitum? Aurum-Verlag, 1990.
Warning: These citations may not always be 100% accurate.