APA (7th ed.) Citation

Papua New Guinea. Department of Education. (1987). Secondary school mathematics 9A: Teachers' guide. Department of Education.

Chicago Style (17th ed.) Citation

Papua New Guinea. Department of Education. Secondary School Mathematics 9A: Teachers' Guide. Port Moresby: Department of Education, 1987.

MLA (9th ed.) Citation

Papua New Guinea. Department of Education. Secondary School Mathematics 9A: Teachers' Guide. Department of Education, 1987.

Warning: These citations may not always be 100% accurate.