There is a clear format for including the author tags in summaries. To start with, you need to include the title and full name of the author, usually in the first sentence of the summary. Here are some examples:
James Joseph, in his article, "Remember When," talks about his experiences in World War II.
In his interesting retrospective article, "Remember When," James Joseph retells his war experiences in World War II.
Retelling his fascinating war experiences in World War II, James Joseph, in "Remember When," gives the reader a glimpse into that period of history from the viewpoint of an eighteen-year-old soldier.
For other ideas on how to do this and more words, you can use as author tags, see my article on citations: http://hubpages.com/academia/MLA-Citation-Guide.