APA (7th ed.) Citation

Christopher Paolini. (2011). Inheritance, or, The vault of souls: Inheritance : book four. Doubleday Children's.

Chicago Style (17th ed.) Citation

Christopher Paolini. Inheritance, or, The Vault of Souls: Inheritance : Book Four. London: Doubleday Children's, 2011.

MLA (9th ed.) Citation

Christopher Paolini. Inheritance, or, The Vault of Souls: Inheritance : Book Four. Doubleday Children's, 2011.

Warning: These citations may not always be 100% accurate.