Tohutoro APA (7th ed.)
Guadagnini, W., & Olaf, E. (2020). Erwin Olaf. Silvana.
Tohutoru Kātū Chicago (17th ed.)
Guadagnini, Walter, me Erwin Olaf. Erwin Olaf. Cinisello Balsamo: Silvana, 2020.
Tohutoro MLA (9th ed.)
Guadagnini, Walter, me Erwin Olaf. Erwin Olaf. Silvana, 2020.
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