Citace podle APA (7th ed.)

Hopson, B., & Scally, M. (1990). 12 steps to success: Through service. Synergy Books International.

Citace podle Chicago (17th ed.)

Hopson, Barrie, a Mike Scally. 12 Steps to Success: Through Service. United Kingdom: Synergy Books International, 1990.

Citace podle MLA (8th ed.)

Hopson, Barrie, a Mike Scally. 12 Steps to Success: Through Service. Synergy Books International, 1990.

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