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Positive Psychology for Individuals
The Positive Power of Negative Thinking: Using Defensive Pessimism to Harness Anxiety and Perform at Your PeakThe Positive Power of Negative Thinking: Using Defensive Pessimism to Harness Anxiety and Perform at Your Peak by Julie K. Norem
Buy new: £7.99 / Used from: £2.86
The best book on constructive thinking and individual differences in optimism and pessimism, for understanding self and others
The Little Book of ConfidenceThe Little Book of Confidence by Susan Jeffers
Buy new: £2.16 / Used from: £0.01
Positive power in your pocket -- compact size and good material
Personal Progress Through Positive Thinking (Alternatives)Personal Progress Through Positive Thinking (Alternatives) by Hilary Jones
Buy used from: £3.65
Positively makes an excellent companion to The Positive Power of Negative Thinking
Positive Thinking: Everything You Have Always Known About Positive Thinking But Were Afraid to Put into PracticePositive Thinking: Everything You Have Always Known About Positive Thinking But Were Afraid to Put into Practice by Vera Peiffer
Buy new: £5.67 / Used from: £0.47
Helpful -- energizing to actually start applying the strategies
Success Through a Positive Mental AttitudeSuccess Through a Positive Mental Attitude by Napoleon Hill
Buy used from: £0.01
The classic book on PMA -- just add updates from PPNT The Positive Power of Negative Thinking
Learned OptimismLearned Optimism by Martin Seligman
Buy used from: £2.46
More than a decade old, but still very good even though it doesn't cover constructive pessimism
The Blank Slate: The Modern Denial of Human Nature (Allen Lane Science)The Blank Slate: The Modern Denial of Human Nature (Allen Lane Science) by Steven Pinker
Buy used from: £4.00
A long but readable book that covers the complexities (positives and negatives) that we find in ourselves and/or other people