The Wingfeather Saga: On the Edge of the Dark Sea of Darkness / North! or Be Eaten / the Monster in the Hollows / the Warden and the Wolf King (The Wingfeather Saga, 1-4)

Wingfeather Saga Boxed Set: On the Edge of the Dark Sea of Darkness; North! Or Be Eaten; The Monster in the Hollows; The Warden and the Wolf King (The Wingfeather Saga)

Pembrick's Creaturepedia (The Wingfeather Saga)

Wingfeather Tales: Seven Thrilling Stories from the World of Aerwiar (The Wingfeather Saga)