Book value is the values as stated in the accounts of the...

Book value is the values as stated in the accounts of the company. In small businesses the accounts are usually prepared on a historical cost basis. Thus book value of assets will be a depreciated cost. Not necessarily related to market value. Book value will include intangible assets at cost or an amortised value based on some sort of formula dictated by the owners or Directors. In larger companies assets are usually revalued to market value, and goodwill is either written off fully or revalued to a justifiable value, as the Directors feel necessary. Auditors have to verify that the holding values show a true and fair view. Thus net book values include intangible assets if they are present. If all intangibles are written off as they occur, then net book value will equal net tangible assets.

Net tangible assets will be all assets and liabilities, but does not include intangible assets, or provisions that are made, that do not conform to adjustment to market value. Net tangible assets thus should conform to approximate market value, in larger companies. If you read any different they are 100 % mistaken. Off course this is not an exhaustive explanation, as nuances do creep in, particular when a company is not a going concern.