Leydecker, Karl, ‘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 (1998), pp. 121–32, doi:10.2307/3733628

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

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

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

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