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What is correct grammer to begin the letter

This has reference to your letter of resignation dated _______, wherein you have requested to be relieved from the services of the company at the earliest.

or

This is with reference to your letter of resignation dated _______, wherein you have requested to be relieved from the services of the company at the earliest.

or

This is in reference to your letter of resignation dated _______, wherein you have requested to be relieved from the services of the company at the earliest.

and also for beginning of experience letter

This is to certify that MR.___________ has worked in our organization .....

or

This is to certify that MR.___________ had worked in our organization .....
Comments  
Hi

I prefer this:

This is with reference to your letter of resignation dated __, wherein you have requested to be relieved from the services of the company at the earliest.

This is to certify that MR.__ worked in our organization ..

Grammar is the way in which words are put together to form proper sentences; morphology and syntax. Grammer is a surname of German and Anglo-Saxon, pre 7th century origins. E.g., the American actor Allen Kelsey Grammer.

Thank you.

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this has

This has reference to...

This is to certify that Mr. Blank worked...