Gaya APA

SIAHAAN, L, A. et al (2017). The validity and reliability test of the Indonesian version of gastroesophageal reflux disease quality of life (GERDQOL) questionnaire . Jakarta: Interna Pubhisning.

Gaya MLA

SIAHAAN, Laura, A. et al. "The validity and reliability test of the Indonesian version of gastroesophageal reflux disease quality of life (GERDQOL) questionnaire". Jakarta: Interna Pubhisning, 2017. Artikel.