It is irrelevant whether you read it on your i Phone, IPad, Android, Blackberry, MAC, laptop or in the library.
Creating references is not about documenting "how" you located the information but providing the reader a direct path to the "original" source of the material.
Use italics for title of a periodical, a book, a brochure or a report.
Use double quotation marks for title of an article, a chapter, or a web page.
Cite the source immediately after the close of the quotation marks.
If the authors are named in the text, they do not have to be used in the citation.
The information in the parenthetical references must match the corresponding information in the list of works cited.
The purpose of parenthetical references is to indicate to readers not only what works you used, but what you used from each source and where in the source you found the material.
In-text citations are called parenthetical references in MLA.
This involves placing information about the source in parentheses after a quote or a paraphrase.