MLA Format includes: Citations, In-text Citations, Page formatting (margins, paragraphing, titles, subtitles, headers and footers, pagination, font).
IB does not care what style of formatting you use as long as everything is done consistently (the same each time) and completely (all necessary information provided to locate sources of information and avoid plagiarism). MLA formatting is generally used in English, Modern Languages, History, Economics, Business, Art, Music, Film, Theater (sometimes in ESS, Mathematics, ITGS & Computer Science).
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From OWL at Purdue
Sometimes you may have to use an indirect source. An indirect source is a source cited in another source. For such indirect quotations, use "qtd. in" to indicate the source you actually consulted. For example:
Note that, in most cases, a responsible researcher will attempt to find the original source, rather than citing an indirect source.
From OWL at Purdue
Sometimes more information is necessary to identify the source from which a quotation is taken. For instance, if two or more authors have the same last name, provide both authors' first initials (or even the authors' full name if different authors share initials) in your citation. For example:
For a source with two authors, list the authors’ last names in the text or in the parenthetical citation:
Corresponding works cited entry:
Best, David, and Sharon Marcus. “Surface Reading: An Introduction.” Representations, vol. 108, no. 1, Fall 2009, pp. 1-21. JSTOR, doi:10.1525/rep.2009.108.1.1
For a source with three or more authors, list only the first author’s last name, and replace the additional names with et al.
Corresponding works cited entry:
Franck, Caroline, et al. “Agricultural Subsidies and the American Obesity Epidemic.” American Journal of Preventative Medicine, vol. 45, no. 3, Sept. 2013, pp. 327-333.
If you cite more than one work by a particular author, include a shortened title for the particular work from which you are quoting to distinguish it from the others. Put short titles of books in italics and short titles of articles in quotation marks.
Citing two articles by the same author:
Citing two books by the same author:
Additionally, if the author's name is not mentioned in the sentence, format your citation with the author's name followed by a comma, followed by a shortened title of the work, followed, when appropriate, by page numbers: