Nollert, A. (1998). Allen Ruppersberg: Letter to a Friend. Portikus.
Chicagoスタイル(17版)引用形式Nollert, Angelika. Allen Ruppersberg: Letter to a Friend. Frankfurt am Main: Portikus, 1998.
MLA(8版)引用形式Nollert, Angelika. Allen Ruppersberg: Letter to a Friend. Portikus, 1998.
警告: この引用は必ずしも正確ではありません.