Heinrich, G. (1967). Hugo Rachel, Johannes Papritz, Paul Wallich (Bd. 2-3: Hugo Rachel, Paul Wallich). de Gruyter.
Chicagoスタイル(17版)引用形式Heinrich, Gerd. Hugo Rachel, Johannes Papritz, Paul Wallich (Bd. 2-3: Hugo Rachel, Paul Wallich). Berlin: de Gruyter, 1967.
MLA(8版)引用形式Heinrich, Gerd. Hugo Rachel, Johannes Papritz, Paul Wallich (Bd. 2-3: Hugo Rachel, Paul Wallich). de Gruyter, 1967.
警告: この引用は必ずしも正確ではありません.