एपीए उद्धरण

Boyd, E. (2009). Premium: C1 level (Coursebook). Harlow (England): Pearson education limited.

शिकागो स्टाइल उद्धरण

Boyd, Elaine. Premium: C1 Level (Coursebook). Harlow (England): Pearson education limited, 2009.

एमएलए उद्धरण

Boyd, Elaine. Premium: C1 Level (Coursebook). Harlow (England): Pearson education limited, 2009.