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Powerhouse. Coursbook: David Evans with Grammar Reference by Peter Strutt, str. 160, ISBN: 0-582-329879-2; Powerhouse. Study Book: Peter Strutt, str. 96, ISBN: 0-582-32560-9.
Powerhouse. Coursbook: David Evans with Grammar Reference by Peter Strutt, str. 160, ISBN: 0-582-329879-2;
Powerhouse. Study Book: Peter Strutt, str. 96, ISBN: 0-582-32560-9.
Uwagi: na str. tytułowych podpisy, wpisy tylko w Study Book (częściowo, ołówek).