DUNCKEL JACQUELINE. (1994). EFFECTIVE SPEAKING FOR BUSINESS SUCCESS MAKING CONFIDENT ... AND MORE. LANCER INTERNATIONAL.
Citazione stile Chigago Style (17a edizione)DUNCKEL JACQUELINE. EFFECTIVE SPEAKING FOR BUSINESS SUCCESS MAKING CONFIDENT ... AND MORE. INDIA CANADA USA: LANCER INTERNATIONAL, 1994.
Citatione MLA (9a ed.)DUNCKEL JACQUELINE. EFFECTIVE SPEAKING FOR BUSINESS SUCCESS MAKING CONFIDENT ... AND MORE. LANCER INTERNATIONAL, 1994.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.