APA

Barrett T. J., . (1954). Earthworms: their intensive propagation and use in biological soil-building; the earthmaster system. Sun Valley, Calif: [Earthmaster Publications].

Chicago

Barrett Thomas Jason, . 1954. Earthworms: their intensive propagation and use in biological soil-building; the earthmaster system. Sun Valley, Calif: [Earthmaster Publications].

Harvard

Barrett T. J., . (1954). Earthworms: their intensive propagation and use in biological soil-building; the earthmaster system. Sun Valley, Calif: [Earthmaster Publications].

MLA

Barrett Thomas Jason, . Earthworms: their intensive propagation and use in biological soil-building; the earthmaster system. Sun Valley, Calif: [Earthmaster Publications]. 1954.