A Dance with Dragons is written by George R.R. MartinGeorge R.R. Martin wrote The World of Ice and FireThe World of Ice and Fire is written by George R.R. Martin
[Human]: Do yo uknow anything about the book A Dance with Dragons? [Assistant]: I do! It was written by George R. R. Martin and is a Speculative novel. [Human]: I like George R. R. Martin, can you tell me anything else he has written? 
Yes, he's also written The World of Ice and Fire. Have you read that one?