Evans V. Viginia & Dooley J. Jenny. (2004). Upstream. Pre-intermediate. Test booklet. Newbury, Express Publishing, 2004.
Chicago-viite (17. p.)Evans V. Viginia ja Dooley J. Jenny. Upstream. Pre-intermediate. Test Booklet. Newbury, Express Publishing, 2004, 2004.
MLA-viite (9. p.)Evans V. Viginia ja Dooley J. Jenny. Upstream. Pre-intermediate. Test Booklet. Newbury, Express Publishing, 2004, 2004.
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