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Spanish name and capitalization rules in MLA citation style
Names
Spanish de is not used before the last name alone.
Example: use Las Casas (when referring to Bartolomé de Las Casas). Cite as Las Casas, Bartolomé de.
Spanish del is capitalized and used with the last name alone:
Example: use Del Río (when referring to Angel Del Río). Cite as Del Río, Angel.
Alphabetize Spanish names by the full surnames.
This becomes complicated when considering given and maternal names, so consult a biographical dictionary for the most accurate representation.
Note: Even persons commonly known by the maternal portions of their surnames, such as Galdos and Lorca, should be alphabetized by their full surnames:
García Lorca, Federico
Pérez Galdós, Benito
Capitalization
Unless they begin a sentence, do not capitalize these:
yo
names of languages and nationalities
names of days of week and months
nouns and adjectives derived from proper nouns
titles preceding personal nameswords meaning "street," "square," and so on, in most place-names.
Titles
Only the first letter of the first word and the first letters of proper nouns are capitalized in titles of articles and journals--there is room for adaptation.
MLA Style is normally used in English, Modern Languages, and some Communication Arts. Ask for the manual at the reference desk to look up specifics.
We have both the 8th and 7th edition at the Reference desk, but the examples here are from the 7th edition.