Riddall, J. G. (1999). Jurisprudence (second edition.). LexisNexis.
Lua i Stíl Chicago (17ú heag.)Riddall, J. G. Jurisprudence. second edition. London ; Dayton, Ohio: LexisNexis, 1999.
Lua MLA (8ú heag.)Riddall, J. G. Jurisprudence. second edition. LexisNexis, 1999.
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