Books like Etika Lingkungan Hidup
A. Sonny Keraf
Etika Lingkungan Hidup is 408 pages, about 7 hours 29 minutes at 250 words a minute.
8 books to read next
How long each takes
The Environmental Ethics and Policy Book 12.3 h 
No One Is Too Small to Make a Difference 2.1 h 
Environmental Science 11.6 h 
Man's Responsibility for Nature 3.9 h 
Cloak of Green 9.1 h 
Environmental Science 11.2 h 
Zimbabwean Sign Language Dictionary 5.5 h 
On Fire 5.3 h Bar height shows length. Estimated at 250 words a minute.