Leydecker, Karl. 1998. ‘The Laughter of Karl Thomas: Madness and Politics in the First Version of Ernst Toller's "Hoppla, wir leben!"’, in Modern Language Review, 93.1, pp. 121–32, doi:10.2307/3733628

Leydecker, Karl. 1999. Review of Raleigh Whitinger, Johannes Schlaf and German Naturalist Drama, in Modern Language Review, 94.4, pp. 1150–51, doi:10.2307/3737311

Leydecker, Karl. 2004. Review of Fred Whalley, The Elusive Transcendent: The Role of Religion in the Plays of Frank Wedekind, in Modern Language Review, 99.3, pp. 834–35, doi:10.2307/3739089

Leydecker, Karl. 2009. Review of Daniela F. Eisenstein, Gunnar Och, Dirk Niefanger, Jakob Wassermann: Deutscher, Jude, Literat, in Modern Language Review, 104.2, pp. 599–600, doi:10.2307/25654915

Leydecker, Karl. 2011. ‘The Avoidance of Divorce in Goethe's Die Wahlverwandtschaften’, in Modern Language Review, 106.4, pp. 1054–72, doi:10.5699/modelangrevi.106.4.1054