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Alexander, F., & Nicholson, J. D. (1968). The blood and saliva clearances of phenobarbitone and pentobarbitone in the horse. Biochem Pharmacol, 17(2), 203–210.
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Grzimek, B. (1968). On the Psychology of the Horse. Man and Animal: Studies in Behavior, , 37–46.
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John, E. R., Chesler, P., Bartlett, F., & Victor, I. (1968). Observation Learning in Cats. Science, 159(3822), 1489–1491.
Abstract: In two experiments cats acquired a stimulus-controlled approach or avoidance response by observational or conventional shaping procedures. Observer cats acquired the avoidance response (hurdle jumping in response to a buzzer stimulus) significantly faster and made fewer errors than cats that were conventionally trained. Observer cats acquired the approach response (lever pressing for food in response to a light stimulus) with significantly fewer errors than cats that were conventionally trained. In some cases, observer cats committed one or no errors while reaching criterion.
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Klingel H Klingel U,. (1968). Equus quagga: Hautpflegeverhalten.
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Klingel H Klingel U,. (1968). Equus quagga: Paarungsverhalten.
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Klingel H Klingel U,. (1968). Equus quagga: Begrüßung.
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Klingel H Klingel U,. (1968). Equus quagga: Kampfverhalten.
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Klingel H,. (1968). Zebrafamilien dauern bis zum Tode. Das Tier 7, , 10–13.
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Klingel H,. (1968). Die Immobilisation von Steppenzebras. Zoolog Garten, 35, 54–66.
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Klingel H,. (1968). Das Sozialleben der Steppenzebras. Naturwissensch Medizin, 5, 10–21.
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