The correct spelling of the word is "source" /sɔːrs/. The phonetic transcription of the word uses the letter 'o' to represent the vowel sound of 'or' /ɔː/, followed by the consonant sound of 's' /s/. The 'u' in "sourse" is incorrect and alters the pronunciation of the word. It is important to spell words correctly to ensure clear communication and understanding. Remember to double-check spellings before submitting written work or sending messages.