Wittaya Piya-arayanan. 2007. Credit rating change and change in firm's probabilities of defaultWittaya Piya-arayanan. Field of Study Finance, Chulalongkorn University;
Wittaya Piya-arayanan. (2007) Credit rating change and change in firm's probabilities of defaultWittaya Piya-arayanan . Chulalongkorn University/Bangkok.
Wittaya Piya-arayanan. Credit rating change and change in firm's probabilities of defaultWittaya Piya-arayanan. . Bangkok:Chulalongkorn University, 2007.
Wittaya Piya-arayanan. (2007) Credit rating change and change in firm's probabilities of defaultWittaya Piya-arayanan . Chulalongkorn University/Bangkok.