Gaya APA

Hallermann, S., Larmer, J. (2011). PBL in The Elementary Grades: Step by Step Guidance, Tools and Tips for Standards-Focused K-S Projects . California: Buck Intitute for Education.

Gaya MLA

Hallermann, Sara., Larmer, John. "PBL in The Elementary Grades: Step by Step Guidance, Tools and Tips for Standards-Focused K-S Projects". California: Buck Intitute for Education, 2011. Text.