Hanley, B. (1983). Hecker, A Missionary to North America. Mahwah, New Jersey.
Lua i Stíl Chicago (17ú heag.)Hanley, Boniface. Hecker, A Missionary to North America. Mahwah, New Jersey, 1983.
Lua MLA (8ú heag.)Hanley, Boniface. Hecker, A Missionary to North America. Mahwah, New Jersey, 1983.
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