Zeiger, I. (1937). Nulla poena sine lege. Stimmen der Zeit, 132(11), 297-304.
Tohutoru Kātū Chicago (17th ed.)Zeiger, Ivo. "Nulla Poena Sine Lege." Stimmen Der Zeit 132, no. 11 (1937): 297-304.
Tohutoro MLA (9th ed.)Zeiger, Ivo. "Nulla Poena Sine Lege." Stimmen Der Zeit, vol. 132, no. 11, 1937, pp. 297-304.
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