Ningtiyas ME. THE EFFECT OF THE COMBINATION OF WHATSAPP AND FACEBOOK SOCIAL MEDIA ON KNOWLEDGE MASTERY AND ATTITUDES OF OBESE TEENAGERS IN BALONGPANGGANG DISTRICT, GRESIK REGENCY. GIZIUNESA [Internet]. 20Mar.2023 [cited 9May2024];3(1):206-14. Available from: https://ejournal.unesa.ac.id/index.php/GIZIUNESA/article/view/50454