APA

Prooks P., . (1998). Invasers From Outer Space : Real-life Stories Of UFOs. London: Dorling Kindersley.

Chicago

Prooks Philip, . 1998. Invasers From Outer Space : Real-life Stories Of UFOs. London: Dorling Kindersley.

Harvard

Prooks P., . (1998). Invasers From Outer Space : Real-life Stories Of UFOs. London: Dorling Kindersley.

MLA

Prooks Philip, . Invasers From Outer Space : Real-life Stories Of UFOs. London: Dorling Kindersley. 1998.