WAKERKWA, Dian Agustina Purwanto; LESTARI, Febriyanti Dwiratna; UTAMI, Silvia; YUWANA, Rawuh Yuda. Advanced English Grammar. PT Akselerasi Karya Mandiri, [S. l.], p. 140, 2026. Disponível em: https://e-publisher.my.id/index.php/ptakm/article/view/200. Acesso em: 23 mei. 2026.