Fried-Booth D. L. Diana L. (1999). P. E. T; Preliminary English Test: Teacher's Book. Longman, 1999.
Lua i Stíl Chicago (17ú heag.)Fried-Booth D. L. Diana L. P. E. T; Preliminary English Test: Teacher's Book. Longman, 1999, 1999.
Lua MLA (9ú heag.)Fried-Booth D. L. Diana L. P. E. T; Preliminary English Test: Teacher's Book. Longman, 1999, 1999.
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