 Twelvetrees' name appears in a sea shanty, "On Board Of The Kangaroo", composed by Harry Clifton.Twelvetrees, an anti-slavery campaigner, wrote a book on the life of a slave – "The Story of the Life of John Anderson, the Fugitive Slave" – published by William Tweedie of London in 1863.The book was reprinted by Dodo Press in 2009.