The Effectiveness Of Slot Substitution In Improving The Vocabulary For The Eighth Grade Students OF SMP Negeri 4 Mengkendek. Jurnal KIP [Internet]. 2017 Dec. 27 [cited 2024 Nov. 24];3(1):495-500. Available from: https://journals.ukitoraja.ac.id/index.php/jkip/article/view/183