Wells, J. C. 1990. Longman Pronunciation Dictionary . This is a specialist dictionary of pronunciation. It covers both British and American English.
Many English words have a number of different possible pronunciations.
For them one main pronunciation, printed in colour, is given at each entry. This is the form recommended for EFL purposes. Other users of LPD, especially those who are native speakers of English, will be interested not only to see what form is recommended but also what variants are recognized. Where pronunciations other than the main one are in common educated use, they too are included, but as secondary pronunciations, printed in black. 1.2 Inflected and derived forms.