"Methodology." . . "Logic." . . . . . "The principles of reasoning : an intro. to logic and scientific method"@en . . . . "The Principles of Reasoning, etc"@en . . . . . . . . . . . "The principles of reasoning : an introduction to logic and scientific method"@en . "The principles of reasoning : an introduction to logic and scientific method" . . . "Reasoning"@en . "The Principles of reasoning" . . . . . "The principles of reasoning an introduction to logic and scientific method"@en . . . . . . . . . "The principles of reasoning, an introduction to logic and scientific method" . . "The principles of reasoning" . . . . . . "The Principles of reasoning : an introduction to logic and scientific methods" . "The principles of reasoning; an introduction to logic and scientific method"@en . "The principles of reasoning; an introduction to logic and scientific method" . . "The principles of reasoning: an introduction to logic and scientific method"@en . . . . . "Logik." . . . .