Touchstones are pieces of media which illicit similar themes to the game. These can come in many forms and some of them are listed here.
Music:
Hard Came the Rain – Ragnbone Man
New Blood – Koda
Dirge for the Planet – Firelake
Books
Metro 2033 – Dimitri Gluhovsky
The Mountain Man – Keith C. Blackmore
The Remaining – DJ Molles
Games
S.T.A.L.K.E.R – GSC Gameworld
Wasteland 2 – Obsidian Entertainment
Dead of Winter – Plaid Hat Games
Films
The Road – John Hilcoat
City of Ember – Gil Kenan
On the Beach – Stanley Kramer