Puberphonia is not a Glottal source

Glottal sounds are in the minority in articulatory terms, since they do not involve the tongue: instead, the articulators are the vocal folds, which constitute a place of articulation as well as having a crucial role invoicing. English has two glottal sounds. The first is all phonic, namely the glottal stop, [ʔ], which appears as an intervocalic realization of/t/in many accents, as in butter 

. The glottal stop is technically voiceless,though in fact it could hardly be anything else, since when the vocal folds are pressed together to completely obstruct the air stream, as must be the case for a stop sound, air cannot simultaneously be passing through to cause vibration. The second, the voiceless glottal fricative [h], is a phoneme in its own right.

/h/ high 

voiceless glottal fricative.

( Reference- Air stream Mechanism and Manner of Articulation

Ana Resti Amalia 

Ana Resti Amalia )

This article also give less importance to Glottal stop.I like to do more work on Glottal stop.The researchers on Tamil literature should help me with relevant Tamil references.

 Tholkappium not including Glottal sound.Raising wind starts from abdomen and moves the diaphragm (a muscular sheet below the lungs). On the way it touches 8 vocal organs. Chest,neck and head are the three places where they touch. Teeth, lip, tongue, nose and palate are the five places where they play before producing voice.

(According to modern science the larynx or voice box is the anchor of vocal folds. It impedes the airflow from the lungs to create vocal folds. A periodic cycle in speech organs produces phonemes.)