ISBN 978-0-8131-9151-5* Steers Jr., Edward, and Holzer, Harold, eds.. "The Lincoln Assassination Conspirators: Their Confinement and Execution, as Recorded in the Letterbook of John Frederick Hartranft".
ISBN 978-0-15-152281-1 description and pictures of Seward's jaw splint, not a neck brace*Steers Jr., Edward, and Holzer, Harold, eds.. "The Lincoln Assassination Conspirators: Their Confinement and Execution, as Recorded in the Letterbook of John Frederick Hartranft".