Dar à luz : ensaio sobre as práticas e crenças da gravidez, parto e pós parto em Portugal / Teresa Joaquim
Telephony : a detailed exposition of the telephone exchange systems of the British Post Office / J. Atkinson
Man's world of sound / John R. Pierce; Edward E. David Jr.
Speech and Hearing / Harvey Fletcher
Telephony : A comprehensive and detailed exposition of the theory and practice of teh telephone art / Samuel G. McMeen, Kempster B. Miller