Mad Men Season 7 Episode 13 was called "The Milk and Honey Route" which was the name of a 1931 "Handbook for Hobos" by Nels Anderson, written under the pseudonym Dean Stiff. Illustrated by Ernie Bushmiller of Nancy and Sluggo fame.
Mildred Pierce, by James M. Cain and The USA Trilogy, by John Dos Passos, Mad Men Season 7, Episode 8 ("Severance"). Roger said "Hey Mildred Pierce. Can I get the check?" referencing the novel by Cain. The waitress was reading the USA Trilogy. Mildred Pierce was a middle-class housewife who separated from her unemployed husband and supported herself and her children as a waitress.
On the Road, by Jack Kerouac, Mad Men Season 7, Episode 12 ("Lost Horizon"). Don says. "Remember On The Road?" Bert replies, "I never read that book. You know that." Don says "I'm riding the rails." and Bert then quotes from the book: “Whither goest thou, America, in thy shiny car in the night?”
Mad Men Season 7 Episode 3, "Field Trip". Bobby is telling his mom about Frankenstein, Dracula, Wolfman, The Mummy, the Creature From the Black Lagoon, and King Kong. He says, "I like all of them but I guess Wolfman is my favorite because he changes into it." Betty says, "Well Dracula changes into a bat." to which Bobby, after briefly thinking about it, excitedly replies "That's true!" http://www.nypl.org/blog/2012/02/27/mad-men-reading-list
In Mad Men Season 7 Episode 6 ("The Strategy") Pete, Peggy, and Don are at Burger Chef, where Peggy wants to shoot a commercial spot. "It's not a home," Pete says. Peggy replies, "It's better. It's a clean, well-lighted place." Pete replies, "Okay, Hemingway." http://www.nypl.org/blog/2012/02/27/mad-men-reading-list