Aitken W. Automatic telephone systems : Vol.1-3. Vol. 1 : Circuits and apparatus as used in the public services, 1921. - XV,282 p. - Текст : непосредственный.
Aitken W. Automatic telephone systems : Vol.1-3. Vol. 2 : Auxiliary services and private and branch exchanges, 1923. - XIII,227 p. - Текст : непосредственный.
Aitken W. Automatic telephone systems : Vol.1-3. Vol. 3 : Large multi-office automatic systems; semiautomatic working; miscellaneous systems; lay-out and wiring; power-plant; traffic, 1924. - XIV,339 p. - Текст : непосредственный.