Write a letter to a cement company asking them to supply you with two references

Dear Sir

 Sub:  Supply of Cement

This is to express our gratitude for fulfilling the Order No.---------- dated 1st April 25 for four wagons of cement. Since this is our first transaction with your company, we would appreciate if you can kindly supply us with two references.

For your convenience, we are enclosing a list of concerns in Singapore, which are already doing business with us for quite some time.

Thanking you

Yours faithfully

(Sales Manager)

Encl.  As stated above