Boontarika Hanvanichavech และ Sucheera Phattharayuttawat. (2015) A study of the relationship between psychological capital and study strategies of upper secondary school in Bangkok. Mahidol University:ม.ป.ท.Boontarika Hanvanichavech และ Sucheera Phattharayuttawat. 2015. A study of the relationship between psychological capital and study strategies of upper secondary school in Bangkok. ม.ป.ท.:Mahidol University;Boontarika Hanvanichavech และ Sucheera Phattharayuttawat. A study of the relationship between psychological capital and study strategies of upper secondary school in Bangkok. ม.ป.ท.:Mahidol University, 2015. Print.