1. REFERANS1 Aslan, M. ve Polat M. (2021) "Reklam Harcamalarının Firma Karlılık Performansına Etkisi", Sosyal Bilimler Akademi Dergisi, 4 (1), 40-61.
2. REFERANS2 Ayaydın, H. ve Karaaslan, İ. (2014) “The Effect of Research and Development Investment on Firms’ Financial Performance: Evidence From Manufacturing Firms in Turkey”, Bilgi Ekonomisi ve Yönetimi Dergisi, 9(1), 23-39.
3. REFERANS3 Baltagı, B. H. (2001) “Econometric Analysis of Panel Data, John Wiley”, New York, 304.
4. REFERANS4 Ben-Zion, U. (1978) “The Investment Aspect of Nonproduction Expenditures: An Empirical Test”, Journal of Economics and Business, 30(3), 224-229.
5. REFERANS5 Breusch, T. & Pagan, A. (1980) “The Lagrange Multiplier Test and İts Applications to Model Specification in Econometrics”, The Review of Economic Studies, 47 (1), 239-253.