You Italicize foreign words (Not absorbed into English)
italics
Quotation marks
The likely reason is that both words are frequently applied to extra-national (foreign) populations. The word ethnic is also applied to minorities and immigrants to connote that they differ from that of the majority, or from another group.
Apostrophe
all of Mexico's words are foreign besides "Mexico". no no no even that is foreign
Maxim Newmark has written: 'Twentieth century modern language teaching' 'Dictionary of foreign words and phrases' -- subject(s): Dictionaries, English language, Foreign words and phrases 'Illustrated technical dictionary, containing standard technical definitions of current terms in the applied sciences, graphic and industrial arts, and mechanical trades' -- subject(s): Dictionaries, Technology 'Dictionary of Foreign Words and Phrases' -- subject(s): Nonfiction, Reference, OverDrive 'Dictionary of foreign words' -- subject(s): Dictionaries, English language, Foreign words and phrases
all of Mexico's words are foreign besides "Mexico". no no no even that is foreign
Capitalization
The Esperanto words for foreign and native are eksterlanda and denaska.
Foreign means from Another Country.
Yes, "foreign" is spelled correctly.
No. Virtually all languages on Earth have foreign words and phrases.