Formula's for (ROIC, Book Value)

For ROIC: there is no one "proper" figure. Different figures mean different things, and have different uses. All ROIC calculations should use some sort of invested capital metric as the denominator. This could uld be PP&E + Net Working Capital or it could be Debt + Book Equity. Generally speaking NOPAT/average(debt + equity) is the most common ROIC figure you'll see around.

Using EBITDA is problematic because it does not adjust for capital intensity, and will likely over-estimate the ROIC of capital intensive businesses, relative to capital light ones. This metric has relatively little use to me, though it's somewhat helpful if D&A is a grossly distorted metric due to acquisitions, write-downs, etc. I would typically then use [EBITDA - Capex - Taxes]/(average capital)] though, in that scenario.

Using EBIT is fine, and can be helpful for comparing the underlying performance of two businesses where one has a much lower tax rate (perhaps because of a history of bankruptcy and thus a large number of loss carryforwards). The drawback of EBIT, as opposed to NOPAT is that using EBIT divorces the underlying relationship between growth in earnings available to the financiers and incremental capital deployed into the business, and thus also makes it less helpful as a metric to judge business quality. Businesses with high tax rates should, all else equal, have higher "EBIT-ROICs" than those in low tax jurisdictions, because the required return on pre-tax capital is higher in a higher tax jurisdiction. Thus "EBIT-ROIC" tells you little about business quality.

When people say "book value" they typically just mean the disclosed shareholder's equity value on the balance sheet. No calculations necessary. But you can also back it out by subtracting total liabilities from total assets. See: (https://en.wikipedia.org/wiki/Accounting_equation