No. You don't need to show the exact source of your income.
However, if there is any LARGE transfer of money in to your account, it might raise a red flag to the case-processing officer.
Better to provide BOTH of the above account-statements, viz. salary account and other account from which you are transferring money.
In that case, in your debit account there will be entry that you had debited money from this account, at the same time there will be credit money entry in your salary account.
This is so because you also need to show statements of accounts for last 6 months.
Hope it helped.
but if i get transferred money from someone`s else account so then i need any source or gift deed kinda thing??