Read this: Presbyterian denominations that trace their heritage to the British Isles usually organise their church services inspired by the principles in the Directory of Public Worship, developed by the Westminster Assembly in the 1640s. This directory documented Reformed worship practices and theology adopted and developed over the preceding century by British Puritans, initially guided by John Calvin and John Knox. It was enacted as law by the Scottish Parliament, and became one of the foundational documents of Presbyterian church legislation elsewhere.

The Presbyterian denominations from the British Isles were inspired by these principles in what document?
What is the answer? (If it cannot be answered, return "unanswerable")
Directory of Public Worship