Context:

Referenced multiple times throughout the episode as a key source for the Titanic story, including examples of survivors' accounts, stories of specific passengers like Emma Bucknell and Rhoda Abbott, and analysis of the tragedy.

Context:

Explicitly mentioned as a book with 'a brilliant section' on Lebanese and Armenian emigrants on the Titanic. Also mentioned later as the book Sadie was reading when they visited Belfast.

Context:

Referenced multiple times throughout the episode as a source for information about the Titanic passengers. Explicitly named when discussing why Taft liked Archie Butt and later when describing passengers Lutie Temple and Imanita Shelley.

Context:

Explicitly mentioned as 'an absolutely brilliant book' containing statistics about Atlantic crossings and mortality rates on sailing ships versus steamships, as well as quotations about Belfast and Edwardian visitors.