11. Specification for normal equal-loudness level contours for pure tones under free-field listening conditions. (29th February 1988) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (16 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
12. Specification for reference levels for narrow-band masking noise. (29th September 1989) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (12 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗