Grotjahn, R. (2014). Der C-test: Aktuelle tendenzen (Peter Lang edition.). Peter Lang Edition.
Tohutoru Kātū Chicago (17th ed.)Grotjahn, Rüdiger. Der C-test: Aktuelle Tendenzen. Peter Lang edition. Frankfurt am Main, [Germany]: Peter Lang Edition, 2014.
Tohutoro MLA (9th ed.)Grotjahn, Rüdiger. Der C-test: Aktuelle Tendenzen. Peter Lang edition. Peter Lang Edition, 2014.
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