Cita APA (7th ed.)
O'Neill, R. (1998). Longman english works: Students'book 1. Longman.
Cita Chicago (17th ed.)
O'Neill, Robert. Longman English Works: Students'book 1. England: Longman, 1998.
Cita MLA (9th ed.)
O'Neill, Robert. Longman English Works: Students'book 1. Longman, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.