Perkins, Bradford
Elementary and secondary schools
John Wiley & Sons, 2001
 Buku Teks
Teaching about Korea : elementary and secondary activities
Korean Educational Development Institute, 1986
 Buku Teks SO
Winkel, Steven R.
Building codes illustrated for elementary and secondary schools : a guide to understanding the 2006 International Building Code for Elementary and Secondary Schools
Wiley, 2007
 Buku Teks SO
Ni Putu Cyntia Suryadewi
Dampak perceraian orang tua terhadap tingkat capaian pendidikan dasar dan menengah anak = The impact of parent's divorce on their children's elementary and secondary education
Fakultas Ekonomi dan BIsnis Universitas Indonesia, 2020
 UI - Skripsi Membership
Mann, J.
Secondary metabolism
Clarendon Press, 1980
 Buku Teks