APA (7th ed.) Citation

Papua New Guinea. Department of Education. (1982). Trial workbooks for grade 9: 9.8 number machines. Department of Education.

Chicago Style (17th ed.) Citation

Papua New Guinea. Department of Education. Trial Workbooks for Grade 9: 9.8 Number Machines. Port Moresby: Department of Education, 1982.

MLA (9th ed.) Citation

Papua New Guinea. Department of Education. Trial Workbooks for Grade 9: 9.8 Number Machines. Department of Education, 1982.