MLA / About Page Numbers
Many electronic sources don't provide standard page numbers. The MLA Style Manual recommends that writers include the number range or total number of pages or paragraphs if they are numbered. In cases where page numbers are unavailable, the MLA Handbook requires that "n. pag." (no pagination) be included in the "Works Cited" entry (see Handbook, pp. 136-37, 165).
MLA / Parenthetical Reference within Your Paper to an Electronic Source
When documenting a work within your paper, use a parenthetical reference (see Handbook, pp. 104, 184-205). The reference should:
point to the source in your Works Cited section by the author's last name, or, if the author isn't given, by a portion of the title; and
identify the location of the information by page number if possible. Omit if not, but include "n. pag." in the "Works Cited" entry.
Example:
From a very young age, children can provide surprisingly accurate descriptions of how they were injured (Peterson).