APA

National Cancer Institute (U.S.), . (1973). Detection of virus in squamous papillomas of the wild bird species Fringilla coelebs. [Washington, D.C: .

Chicago

National Cancer Institute (U.S.), . 1973. Detection of virus in squamous papillomas of the wild bird species Fringilla coelebs. [Washington, D.C: .

Harvard

National Cancer Institute (U.S.), . (1973). Detection of virus in squamous papillomas of the wild bird species Fringilla coelebs. [Washington, D.C: .

MLA

National Cancer Institute (U.S.), . Detection of virus in squamous papillomas of the wild bird species Fringilla coelebs. [Washington, D.C: . 1973.