APA (7th ed.) Citation

WALLLLLACE, A. Langkah-langkah hijau. Yayasan Obor Indonesia.

Chicago Style (17th ed.) Citation

WALLLLLACE, AUBREY. Langkah-langkah Hijau. Yayasan Obor Indonesia.

MLA (8th ed.) Citation

WALLLLLACE, AUBREY. Langkah-langkah Hijau. Yayasan Obor Indonesia.

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