(1992). Kartoffel. [S.n.].
Cita Chicago (17th ed.)Kartoffel. [S.l.]: [S.n.], 1992.
Cita MLA (8th ed.)Kartoffel. [S.n.], 1992.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)
(1992). Kartoffel. [S.n.].
Cita Chicago (17th ed.)Kartoffel. [S.l.]: [S.n.], 1992.
Cita MLA (8th ed.)Kartoffel. [S.n.], 1992.