The request, if you'll pardon the expression, is a little vague.
Every church has a "liturgy," some are more regular or more defined than others; some are more ornate and professional than others; some are attached to some particular place and time in history, in preference to others of newer or later origin/reformation.
If you want "high-church" defenses of a non-Romanist or heirarchical type, you might want to inquire after certain Lutheran or Anglican resources.
"High" Presbyterianism can appear "high-church-liturgical" to people who are (or who think they are) "low-church," but a Directory for Public(k) Worship driven service occupies something of a middle-ground between low-and-high church worship. Likewise, a Reformed service that follows the Dort-approved order (A.D.1619, parts of which are as old as the 1566
Psalter of Danthenus). In my view, the reintroduction of certain high-liturgical elements into some Presbyterian churches has taken those churches back further than the Reformation; and the attempt to "reform" the Reformers is largely unhelpful. Most American Presbyterians with a background prior to the 1990s in conservative circles grew up accustomed to a "Low" Presbyterianism, that was still considerably higher (liturgically) than a typical Colonial or Early American Presbyterian.
What today is (sometimes derisively) called "traditional" worship, with a fairly fixed Order of Service having limited elements, is actually the vestiges of "Protestant" worship, which may range from a high at "Low-Anglicanism" to a low at "Primitive Baptist." The truth is that there once was little surface difference between the conduct of worship of any American Colonial church, with the exception of the Anglicans, who weren't that different. One anecdote tells of the Huguenot migration to South Carolina, where most assimilation took place toward the Anglicans, rather than the Presbyterians, due to the marked "lowering" of the liturgy among the Colonials, versus the higher expectations of the recent refugees from France.
An irony of more modern history is the observation that today's "rock-stage" church-entertainment, stripped of its cultural aesthetic, isn't low-church at all, but a huge production and highly orchestrated and manipulative. Essentially uber-high-church, despite often deprecating the "stuffy" types.
I will add, that the old Anglican Book of Common Prayer (not a modern revision) contains quite a bit of excellent devotional and prayer material. You can go to Concordia Publishing to look for some Lutheran materials defending their use of church symbols, historic liturgy, church calendar, saints-days, etc. for example their book "Behold the Lamb" (not an endorsement). These are traditions that stand a little closer to the unreformed traditions of the Medieval and Ancient periods; and are not typical Reformed or Presbyterian persuasions.
But, if you are mainly interested in a defense of the shape of Reformed liturgy, this would be a good book:
Amazon.com: Worship (Revised and Expanded Edition) (9780664225797): Hughes Oliphant Old: Books
