Humble, John William
Meningkatkan hasil perusahaan = Improving business results
Erlangga, 1979
 Buku Teks
Delvya Mayasari
Analisis aperture untuk meningkatkan hasil stacking pada metode common reflection surface stack = Aperture analysis for improving stacking result in common reflection surface stack method
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2009
 UI - Skripsi Open
Gita Rahmatika
Peranan independensi dan kompetensi auditor internal dalam peningkatan kualitas hasil audit di Badan Narkotika Nasional = The role of internal auditor independence and competence in improving the quality of audit result in Badan Narkotika Nasional
2017
 UI - Tesis Membership
Improving business performance
edited by Vas Prabhu and Malcolm Baker
McGraw-Hill, 1986
 Buku Teks
Humble, John William
Improving business results
McGraw-Hill, 1968
 Buku Teks