Dictionary of Contemporary Slang
Tony Thorne
Geheimnisvolles am Horizont: von Ufos und Ausserirdischen
Carl Gustav Jung
Note on the Problem of Great Stellar Distances
Harlow Shapley
The Secret Adversary
Agatha Christie
Tommy and Tuppence Mysteries (1)
The Arrogance of Power: The Secret World of Richard Nixon
Anthony Summers
The Game: Undercover in the Secret Society of Pickup Artists
Neil Strauss