Chaiyanant Panyasiri. 2008. Organizational commitment of the staff of the PTT group. School of Public Administration, National Institute of Development Administration;

Chaiyanant Panyasiri. Organizational commitment of the staff of the PTT group. . Bangkok:National Institute of Development Administration, 2008.

Chaiyanant Panyasiri. (2008) Organizational commitment of the staff of the PTT group . National Institute of Development Administration/Bangkok.