Context:

Explicitly mentioned as 'his book' when discussing First World War statistics - '65 million men were mobilized in the First World War, 20 million people died' - and noted that they will be talking about it a lot in subsequent episodes about WWI

Context:

Described as 'a brilliant book' that both hosts have read. Tim Butcher was a war correspondent in Sarajevo during the civil wars and later retraced Gavrilo Princip's footsteps from his remote birthplace to Sarajevo to Belgrade. Referenced multiple times for detective work on Princip's school reports and family history

Context:

Explicitly mentioned as 'his book' when discussing a story about Princip arriving in Sarajevo and refusing to stay at a Muslim innkeeper's guest house. Dedier was a Yugoslav author who tried to collate stories about Princip after World War II