https://en.wikipedia.org/wiki/International_Phonetic_Alphabet

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https://en.wikipedia.org/wiki/Received_Pronunciation

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https://en.wikipedia.org/wiki/IPA_vowel_chart_with_audio

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https://en.wikipedia.org/wiki/IPA_pulmonic_consonant_chart_with_audio

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容認発音（クイーンズ イングリッシュ）について　(Wikipedia Japan)

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容認発音（クイーンズ イングリッシュ）について(weblio)

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http://www.bbc.co.uk/learningenglish/english/features/pronunciation/longvowel1