Rückriem, U. (1971). A Metal Ring Encircling a Tree: An Interview with Ulrich Rückriem. Avalanche.
Chicagoスタイル(17版)引用形式Rückriem, Ulrich. "A Metal Ring Encircling a Tree: An Interview with Ulrich Rückriem." Avalanche 1971.
MLA(8版)引用形式Rückriem, Ulrich. "A Metal Ring Encircling a Tree: An Interview with Ulrich Rückriem." Avalanche, 1971.
警告: この引用は必ずしも正確ではありません.