Shimizu, T., Hatakeyama, N., & Burkhard, B. (2008). Two mountains: Naoya Hatakeyama and Balthasar Burkhard (2. Aufl.).
Lua i Stíl Chicago (17ú heag.)Shimizu, Toshio, Naoya Hatakeyama, agus Balthasar Burkhard. Two Mountains: Naoya Hatakeyama and Balthasar Burkhard. 2. Aufl. Salzburg, 2008.
Lua MLA (8ú heag.)Shimizu, Toshio, et al. Two Mountains: Naoya Hatakeyama and Balthasar Burkhard. 2. Aufl. 2008.
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