Παραπομπή σε μορφή APA (7η εκδ.)

Obee B. Bob & Evans V. Virginia. (2006). Upstream. Upper-Intermediate B2+: Workbook: Student's Book. Newbury, Express Publishing, 2006.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Obee B. Bob και Evans V. Virginia. Upstream. Upper-Intermediate B2+: Workbook: Student's Book. Newbury, Express Publishing, 2006, 2006.

Παραπομπή σε μορφή MLA (9th εκδ.)

Obee B. Bob και Evans V. Virginia. Upstream. Upper-Intermediate B2+: Workbook: Student's Book. Newbury, Express Publishing, 2006, 2006.