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Vandewalle, K.: SISO of trefwoorden voor de jeugd? (1995)
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Voorbij, H.: ¬Een goede titel behoeft geen trefwoord, of toch wel? : een vergelijkend oderzoek titelwoorden - trefwoorden (1997)
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Verweij, W.C.: Trefwoorden bij de UB Amsterdam (1982)
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Voorbij, H.: Titelwoorden - trefwoorden : een vergelijkend onderzoek (1997)
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Trefwoorden : Handboek voor opleiding en praktijk (1981)
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