I.P. Christensen & Sebastian Halliday 
BIOS Instant Notes in Psychology [PDF ebook] 

Instant Notes in Psychology contains the fundamental topics that are essential to the student. Each topic begins with a Key Notes panel containing concise summaries of the key points covered, which are expanded in the main text of the topic. Although each topic stands alone, it is the nature of the psychology that topics are interrelated. To help the student see these interrelationships the text provides numerous cross-references between topics.