Coulson, C.A.
Valence
Oxford University Press, 1972
Buku Teks SO
Tanya Fitriyani
Tingkat kepadatan dalam Commuter Line serta hubungannya dengan fluktuasi valensi dan arousal penumpang = Level of density in Commuter Line and its relation with passengers valence and arousal fluctuations
2016
UI - Skripsi Membership
Murrel, J.N.
Valence theory
John Wiley & Sons, 1965
Buku Teks SO
Gordon, Robert Aaron
Business fluctuations
Harper & Brothers, 1952
Buku Teks
Lee, Maurice W.
Macroeconomics fluctuations, growth and stability
Richard D. Irwin, 1967
Buku Teks