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¿Ser or Estar? That is the question.
Demystifying Spanish Grammar: An Advanced Spanish Grammar Guide, Clarifying the Written Accents, Ser/Estar (Verbs), Para/Por (Prepositions), Imperfect/Preterit (Past Tenses), & the Spanish SubjunctiveDemystifying Spanish Grammar: An Advanced Spanish Grammar Guide, Clarifying the Written Accents, Ser/Estar (Verbs), Para/Por (Prepositions), Imperfect/Preterit (Past Tenses), & the Spanish Subjunctive by Brandon Simpson
Buy new: £7.95 / Used from: £12.28
My own book on Spanish grammar that has a chapter explaing "ser" and "estar."
Spanish Verbs: Ser and Estar - Key to Mastering the Language (Hippocrene Language Studies)Spanish Verbs: Ser and Estar - Key to Mastering the Language (Hippocrene Language Studies) by J. Serrano
Buy used from: £4.77
This book about "ser" and "estar" does a very good job explaining these troublesome verbs.
Practice Makes Perfect Spanish Verb Tenses (Practice Makes Perfect Series)Practice Makes Perfect Spanish Verb Tenses (Practice Makes Perfect Series) by Dorothy Richmond
Buy new: £4.34 / Used from: £3.40