http://repository.uhamka.ac.id/id/eprint/14502/
RPS KDBA
Zulherman, Zulherman
http://repository.uhamka.ac.id/id/eprint/14502/1/RPS%20Konsep%20Dasar%20Bumi%20dan%20Antariksa.pdf
Jurnal Ekonomi
http://repository.uhamka.ac.id/id/eprint/14502/
RPS KDBA
Zulherman, Zulherman
http://repository.uhamka.ac.id/id/eprint/14502/1/RPS%20Konsep%20Dasar%20Bumi%20dan%20Antariksa.pdf