Bluestone garden edge

I'm just wondering what is the preferred way to lay a Bluestone garden edge like this picture. Is it just a sand base, or mortar? And do I need to put any bond crete or any thing in the Mortar joins and or base?

13367982714_a5a552737c_b.jpg
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• 13367982714_a5a552737c_b.jpg (411.0 KB)

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