Stahl, W., Wien, D., & Leib, B. M. (1967). Hamburg from 7 to 7: An unusual Guide to an unusual city / Walter Stahl; Dieter Wien. Seehafen-Verlag.

Stahl, Walter, Dieter Wien, and Betty; McKerrow Leib. Hamburg from 7 to 7: An Unusual Guide to an Unusual City / Walter Stahl; Dieter Wien. Hamburg: Seehafen-Verlag, 1967.

Stahl, Walter, et al. Hamburg from 7 to 7: An Unusual Guide to an Unusual City / Walter Stahl; Dieter Wien. Seehafen-Verlag, 1967.