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Ocenjavane na kadrite : spravočnik
Šopov, Dimităr A., (1986)
Economic and behaviorist effects of payment by results and company characteristics : a study of white collar employees
Harju, Ansa, (1992)
Award restructuring : factors associated with its progress and success
Wooden, Mark, (1990)
Kolektivăt stopanin : naš i čuždestranen čelen opit
Spasov, Vasil, (1986)
Sǔrevnovanie i vutrešno-stopanska smetka
Spasov, Vasil, (1981)