Morris ,J.H.C. (1962). Rule Against Perpetuities (2nd.). Steven & Sons.
Lua i Stíl Chicago (17ú heag.)Morris ,J.H.C. Rule Against Perpetuities. 2nd. London: Steven & Sons, 1962.
Lua MLA (9ú heag.)Morris ,J.H.C. Rule Against Perpetuities. 2nd. Steven & Sons, 1962.
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