Now, Appellant intends to say that he has not maintained books of accounts and therefore, those amounts can not be considered. When Appellant is doing business, then it was incumbent on him to maintain proper books and/ or books of account. It may be in any form. Therefore, if he had not maintained it, then he can not be allowed to take advantage of his own wrong. Burden lies on him to show from where he has received the amount and what is its nature. Unless this fact is explained he can not claim or have deduction of the said amount from the income tax. Sec. 68 of I. T. Act provides that where the assessee offers no explanation about the nature and source of the credits in the books of account, all the amounts so credited or where the explanation offered by the assessee is not satisfactory in relation to the same then such credits may be charged to tax as income of the assessee for that particular previous year