Luminous efisiensi
Universitas Indonesia, 1990
 UI - Tugas Akhir
Alexander, Christopher, author
The nature of order : an essay on the art of building and the nature of the universe Book 4: the luminous ground
The Center for Environmental Structure, 2002
 Buku Teks
Efisiensi cascade aerator
Fakultas Teknik Universitas Indonesia, 1993
 UI - Skripsi (Membership)
Herry Amin, author
Pengukuran efisiensi perusahaan pelayaran PT. S
1989
 UI - Skripsi (Membership)
Gie, The Liang
Efisiensi kerja bagi pembangunan negara
Gadjah Mada University Press, 1976
 Buku Teks
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