words and short phrases from foreign languages: Länder, carte blanche; except for proper names, names of persons, institutions, places, etc. and not usually for foreign quotations.
Not all foreign words are italicised, however; a number have been assimilated into current English and are set in roman:
café, alias, detour, etc.
Use quotation marks to cite quotations from books and periodicals rather than italic. The simultaneous use of italic and quotation marks must be avoided.
Latin abbreviations and phrases
e.g.; et al.; et seq., ibid.; i.e.; NB; op. cit.
Latin words should usually be printed in italic (e.g. ex ante), but certain common Latin phrases take roman (refer to the New Oxford dictionary for writers and editors for italic or roman style).
Examples of roman:
ad hoc, ad infinitum, inter alia, per capita, pro forma, status quo