APA

Poulsen H., . (1953). A study of incubation responces and some other behaviour patterns in birds. [Lugar de publicación desconocido]: [Editor desconocido].

Chicago

Poulsen Holger, . 1953. A study of incubation responces and some other behaviour patterns in birds. [Lugar de publicación desconocido]: [Editor desconocido].

Harvard

Poulsen H., . (1953). A study of incubation responces and some other behaviour patterns in birds. [Lugar de publicación desconocido]: [Editor desconocido].

MLA

Poulsen Holger, . A study of incubation responces and some other behaviour patterns in birds. [Lugar de publicación desconocido]: [Editor desconocido]. 1953.