APA

Puerto Rico, . (1970). A survey of x-radiation from color T. V. receivers in the metropolitan area of San Juan, Puerto Rico, July, 1970. [San Juan]: .

Chicago

Puerto Rico, . 1970. A survey of x-radiation from color T. V. receivers in the metropolitan area of San Juan, Puerto Rico, July, 1970. [San Juan]: .

Harvard

Puerto Rico, . (1970). A survey of x-radiation from color T. V. receivers in the metropolitan area of San Juan, Puerto Rico, July, 1970. [San Juan]: .

MLA

Puerto Rico, . A survey of x-radiation from color T. V. receivers in the metropolitan area of San Juan, Puerto Rico, July, 1970. [San Juan]: . 1970.