FELTHAM, R. (1982). Diplomatic Handbook R.G. Feltham. Longman.
Lua i Stíl Chicago (17ú heag.)FELTHAM, R.G. Diplomatic Handbook R.G. Feltham. Longman, 1982.
Lua MLA (8ú heag.)FELTHAM, R.G. Diplomatic Handbook R.G. Feltham. Longman, 1982.
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