These books are by Glen A. Larson and Roger Hill. The first three were published in the US by Pinnacle Books Inc. The last one may only have been published in the UK as it doesn't say anything about the US release:

Knight of the Phoenix (Black Cover, 1983) Trust Doesn't Rust (Red Cover, 1984) Hearts of Stone (Blue Cover, 1984) The 24-Carat Assassin (Yellow Cover, 1984)

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Place for UK Annuals Information

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Knight Rider Legacy