Wrenn, L. G. (1998). The invalid marriage. Canon Law Society of America.
Lua i Stíl Chicago (17ú heag.)Wrenn, Lawrence G. The Invalid Marriage. Washington, D.C.: Canon Law Society of America, 1998.
Lua MLA (8ú heag.)Wrenn, Lawrence G. The Invalid Marriage. Canon Law Society of America, 1998.
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