APA

Thorpe (Edgar); Thorpe (Showick), . (2001). General Knowledge Manual 2001. : .

Chicago

Thorpe (Edgar); Thorpe (Showick), . 2001. General Knowledge Manual 2001. : .

Harvard

Thorpe (Edgar); Thorpe (Showick), . (2001). General Knowledge Manual 2001. : .

MLA

Thorpe (Edgar); Thorpe (Showick), . General Knowledge Manual 2001. : . 2001.