'TH': Consonant Sound / ð / a...
English Sounds - The Two TH Consonant...
ð SOUND
"th" [θ] [ð] consonant soun...
Introduction to Articulatory Phonetic...
The difference between /θ/ and /ð/
Dental Fricative Sounds (TH sound)
English pronunciation – Comparison - ...
The /ð/ sound (th)