• https://repository.unej.ac.id/items/15008357-7c80-4e0b-8971-ff7acac7919b
• https://repository.unej.ac.id/items/0aa0b0a2-d33a-401c-94c5-30495ff87a36
• https://repository.unej.ac.id/items/f91b580d-085a-46b9-a0ee-505c34e8c4d8