An authority may: issue bonds for any of its corporate purposes; issue refunding bonds to pay or retire its bonds; and issue any kinds of bonds, including bonds on which the principal and interest are payable: only from the income and revenues of the housing project financed with the proceeds of the bonds or with these proceeds and a grant from the State or federal government in aid of the housing project; only from the income and revenues of designated housing projects whether or not they were financed wholly or partly with the proceeds of the bonds; or from its revenues generally. To secure any of its bonds, an authority may pledge any revenue or mortgage a housing project or other property of the authority.