MURPHY, R. (1990). Essential grammar in use: A self-study reference andpractice book for elementary students of english. Cambridge University Press.
Citação do estilo Chicago (17ª ed.)MURPHY, Raymond. Essential Grammar in Use: A Self-study Reference Andpractice Book for Elementary Students of English. Cambridge: Cambridge University Press, 1990.
Citação MLA (9ª ed.)MURPHY, Raymond. Essential Grammar in Use: A Self-study Reference Andpractice Book for Elementary Students of English. Cambridge University Press, 1990.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.