Gaya APA

WHO, Geneva. (1987). Air quality guidelines for europe . Malang Kota: WHO, Geneva.

Gaya Chicago

WHO, Geneva. Air quality guidelines for europe. Malang Kota: WHO, Geneva, 1987. Text.

Gaya MLA

WHO, Geneva. Air quality guidelines for europe. Malang Kota: WHO, Geneva, 1987. Text.

Gaya Turabian

WHO, Geneva. Air quality guidelines for europe. Malang Kota: WHO, Geneva, 1987. Print.