Books by William Harper:
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Harper, William, active 18th century: The Advice of a Friend, to the Army and People of Scotland (ca. 1745) (multiple formats at archive.org)- Harper, William, active 18th century: A Treatise of Infallibility: Shewing That the Church of Rome's Claim to That High Privilege is Without Foundation in Scripture, Antiquity, or Reason, In Answer to a Paper on That Subject Sent by a Popish Missinanry (Edinburgh: Printed for W. Gordon, 1752) (multiple formats at archive.org)
Find more by William Harper at your library, or elsewhere.