[1]
Ulfah, A.H. and Supahar 2025. Polytomous items analysis with gpcm model on development of science process skills performance assessment in biology subject. Biosfer: Jurnal Pendidikan Biologi. 18, 2 (Dec. 2025), 437–452. DOI:https://doi.org/10.21009/biosferjpb.53403.