For the most part, only scholarly sources are the only acceptable formats to be used and cited in a college level research assignment.
1) Scholarly sources are ones which are written by and for people who study and teach about a particular topic.
2) They are often difficult to read, as they frequently use "jargon" that may be unfamiliar to the general public.
3) Scholarly sources do not include advertisements and they use only graphs, charts, and informative drawings or images as illustrations.
4) Include documentation for facts and statistics in a bibliography, notes, or cited reference list.
Finally, don't think that sources which are not scholarly are therefore not useful, valuable, or correct. For instance, a newspaper article from La Opinion or a magazine article in Hispanic about the opinions of U.S. Latinos regarding the DREAM Act, may be appropriate for a class in Chicano/a & Latino/a Studies even though they are not considered scholarly.