Παραπομπή σε μορφή APA (7η εκδ.)

Papua New Guinea. Department of Education. (1982). Trial workbooks for grade 9: 9.9 circles. Department of Education.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Papua New Guinea. Department of Education. Trial Workbooks for Grade 9: 9.9 Circles. Port Moresby: Department of Education, 1982.

Παραπομπή σε μορφή MLA (9th εκδ.)

Papua New Guinea. Department of Education. Trial Workbooks for Grade 9: 9.9 Circles. Department of Education, 1982.