Παραπομπή APA

Madan Gopal & Kumar, S. (1955). Interstate salestax rules.

Παραπομπή Chicago Style

Madan Gopal και Surender Kumar. Interstate Salestax Rules. 1955.

Παραπομπή MLA

Madan Gopal και Surender Kumar. Interstate Salestax Rules. 1955.